Answer:
complementary base-pairing rules
Explanation:
DNA is the genetic material of living cells. It is a long chain of double-stranded molecules, in which each strand is complementary to one another i.e. Adenine base is paired with Thymine base while Guanine base pairs with Cytosine base following the complementary base pairing rule as proposed by Chargaff. This pairing is responsible for the double helical structure of the DNA.
The complementary base pairs that a DNA molecule contains make it able to produce identical copies of itself during replication or duplication. Before replication of DNA can occur, the double strands need to unwind to form two separate strands, which serves as a template for the synthesis of new complementary strands.
In this manner, each new strand contains one template strand and one complementary strand, which forms two new double helix that is identical to the original strand. This two identical copies of DNA gets separated into two daughter cells, which is the essence of the DNA replication.
Which type of epithelium lines the inferior portions of the pharynx?
Answer:
The type of epithelium that lines the inferior portions of the pharynx is stratified squamous epithelium.
Explanation:
The pharynx is a structure made up of muscles and mucous membranes -like many internal organs- that is part of the respiratory system and is an intermediate step in the digestive tract.
This structure has two portions:
Upper or nasopharynx Lower, or oropharynx, in contact with the airways.Some even propose that the borderline surface between the pharynx and larynx can be called the laryngopharynx, due to its tissue structure.
The lower portion of the pharynx is covered by a squamous stratified epithelium, the inner layers of which rest on a basal lamina. The more superficial layers provide protection to the interior of the pharynx against friction, in addition to remaining lubricated by mucous secretion at that level.
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What activity does bipedalism in primates describe? Group of answer choices walking on two feet walking on four feet walking using two legs and a tail swinging from branch to branch
Bipedalism in primates is described as walking on two feet.
Explanation:
Bipedalism refers to the ability of walking on two feet. This is an evolutionary adaptation that has developed in many higher animals and has enabled them to reside and survive in diverse habitat. Though bipedalism is possible in all primates but it is generally not followed by them except in human beings.
Answer:
walking on two feet
Explanation:
took the quiz
Although the mechanisms by which aerobic training leads to enhanced aerobic performance in adolescents are still unclear, it is likely that ________________ may play a role.
Answer:
increased maximal stroke volume
Explanation:
Stroke volume is the amount of blood put out by the left ventricle during a contraction. By doing the regular aerobic training one can increase its maximal stroke volume. More the stroke volume of a person less will be its heart rate because more amount of blood will be pumped by the heart in a single time.
This is the reason why athletes have a decreased heart rate than normal people. So till now the mechanism of enhanced aerobic performance lead by aerobic training is not clear but it can be said that increased maximal stroke volume may play a role.
While testing for biological macromolecules in an unknown, you find that it reacts strongly with iodine and the solution immediately turns a very dark black. The macromolecule at hand must be:_________.
The macromolecule must be starch.
Explanation:
Starch is a polymer of Glucose joined by glycosydic bond.
Starch is the main energy storage substance in green plants.
Starches react with iodine and give a bluish black or black color and thus iodine test is considered as a confirmatory test for starches.
In this experiment ,the solution turns very dark black on addition of iodine so we can be sure that the solution contained starch.
1. The carrier proteins through which sugar enters pancreatic beta cells have______.A. A Lower Km.B. A Higher Km.C. The Same Km.2. Than the carriers through which sugar enters muscle cells . In order for muscle cells to increase sugar import_______.A. Blood sugar levels must be high.B. Insulin must be present.C. Glycogen must be present.D. Glucagon must be present.3. Oh, and glucokinase has a______when compared to hexokinase.A. High Km.B. Low Km. 4. ________are responsible for the release of transferrin from the transferrin receptor and iron form transferrin. A. Proton Pumps.B. Iron Reductases.C. Ferriportins.D. Iron Oxidases.5. ________Convert the iron to the active form in which it may be exported.A. Proton Pumps.B. Iron Reductases.C. Ferriportins.D. Iron Oxidases. 6. This happens in the_______.A. Lysosome.B. Cytoplasm.C. Intermembrane Space.D. Interstitial Fluid.
The carrier proteins through which sugar enters pancreatic beta cells have "Higher Km" (a high Km indicates low affinity for the substrate) than the carriers through which sugar enters muscle cells at fasting blood sugar levels.
In order for muscle cells to increase sugar import Insulin "must be present". Oh, and glucokinase has a High Km (a lower affinity for glucose ) when compared to hexokinase.
"Proton pumps" are responsible for the release of transferrin from the transferrin receptor and iron form transferrin (Proton pumps are transporters that move hydrogen ions from regions with low concentration to regions with higher concentration)
"Iron Reductases" convert the iron to the active form in which it may be exported (ferric iron is converted to ferrous iron by ferric reductase). This happens in the "Lysosome" (lysosome is an organelle that contains hydrolytic enzymes)
What is not a role of activated complement?
what the activated complement does is protect the body by sending out WBS's wherever infections are located, this is it's only function.
ANSWER 4 QUICK QUESTIONS!!
What accomplishment are you most proud of? ...
Which of your friends are you proudest of? ...
What's the most beautiful place you've ever been? ...
Do you feel like a leader or a follower? ...
Answer:
Quick?
Explanation:
My garden.
My best friend.
the mountains.
Follower.
Answer:
I am proud of washing the dishes
My friend I'm most proudest of is James, because he washed the dishes
The most beautiful place I've been to is the sink.
I feel like a leader because I wash the dishes
Explanation:
A team of scientists and dentists collaborates to develop a toothpaste that can instantly whiten teeth. A meeting is held so that the team members are acquainted with each other. The members formally introduce themselves and collectively establish group norms. This group is in the _____ stage of team development.
Answer:
forming
Explanation:
Team development is a process wherein different individuals come together and learn to work efficiently to carry out a specific task.
There are certain stages that a team goes through during the development phase and these are:
1. Forming
2. Storming
3. Norming
4. Performing
5. Adjourning
The stage of team development where the different members get to know each other and orient themselves concerning each other's space is known as forming. This is a stage where they get acquainted with each other and explore and learn the ideas fo different team members.
Since in the given situation the scientists and dentists are holding a team meeting to get acquainted with each other and formally introducing themselves, the team is currently in the development stage of forming.
A grasshopper jumps along a line. His first jump takes him 1 cm., the second 2 cm, etc. Each jump can take him to the right or to the left. Prove that after 2017 jumps, the grasshopper cannot be in the same location it started.
Answer:
The grasshopper cannot be in the same location it started because by 2017, it would have covered a distance of 1017576.5 to either left or right. and that distance is not an integer.
Explanation:
The grasshopper jumps in integer of 1 cm to either right or left
Calculating for the total distance covered in 2017 jumps
Total Distance = (2017 x 2018)/2 = 2035153 cm
To either right or left: this implies that the total distance be divided by 2
=> 1017576.5 cm
It shows that at some point, the grasshopper will not be in a position of integer on either right or left.
Therefore, it can not get to its initial point of start.
To prove that after 2017 jumps the grasshopper cannot be in the same location it started, we can calculate the total distance covered by the grasshopper. By using the formula for the sum of an arithmetic series, we find that the grasshopper would have covered a total distance of 2036171 cm after 2017 jumps. Therefore, the grasshopper cannot be in the same location it started.
Explanation:To prove that after 2017 jumps the grasshopper cannot be in the same location it started, we need to consider the distance covered by each jump. The grasshopper jumps 1 cm in the first jump, 2 cm in the second, and so on. We can observe that the distance covered in each jump is increasing by 1 cm. Therefore, after 2017 jumps, the grasshopper would have covered a total distance of 1 + 2 + 3 + ... + 2017 cm.
To find this total distance, we can use the formula for the sum of an arithmetic series: S_n = (n/2) * (a_1 + a_n), where S_n is the sum of the first n terms, a_1 is the first term, and a_n is the nth term. In this case, n = 2017, a_1 = 1, and a_n = 2017.
Substituting these values into the formula, we get S_n = (2017/2) * (1 + 2017) = 2017/2 * 2018 = 2036171 cm.
Based on this calculation, we can conclude that after 2017 jumps, the grasshopper would have covered a total distance of 2036171 cm. Since this distance is greater than zero, it is impossible for the grasshopper to be in the same location it started.
The human stress system evolved to deal with events such as getting chased by a lion. Which modern stress activates the stress system in the same way as getting chased by a lion?
Final answer:
Modern stressors like public speaking or deadlines trigger the fight or flight response similar to ancestral threats like being chased by a lion. This chronic activation of the stress system can lead to serious health issues.
Explanation:
The modern stress that activates the stress system in the same way as getting chased by a lion would be psychological threats, such as public speaking or facing a looming deadline. These modern stressors activate the fight or flight response, which the human nervous system has evolved over millions of years to handle immediate physical threats. The autonomic nervous system triggers a series of hormonal and physiological adjustments when faced with such stress. Unfortunately, modern stressors tend to be prolonged and can lead to chronic activation of this system, which can have serious health consequences, including cardiovascular disease, diabetes, anxiety disorders, depression, and impaired judgment.
After teaching a class about the endocrine system, the instructor determines that the students need additional instruction when they identify which of the following as an endocrine gland?
A)
Pancreas
B)
Adrenal gland
C)
Testes
D)
Kidneys
Answer:
The correct answer is D) Kidneys
Explanation:
The endocrine system contains the glands which secrete their secretion called hormone directly in the blood because their target organs are situated distantly from them where the hormone reach through blood.
Pancreas, adrenal gland, and testes are the endocrine glands which secrete hormones directly in the blood. The kidney is not an endocrine gland and does not secrete any hormone. The kidney is responsible for filtering blood and removal of nitrogenous and other waste from the body. Therefore the correct answer is D.
In C3 plants the conservation of water promotes_______.a. photorespiration. b. a shift to C4.c. photosynthesis.d. the opening of stomata.e. the light reactions.
Answer:
A) photorespiration.
Explanation:
Photorespiration is the harmful metabolic process which takes place when the concentration of oxygen in the leaf increases compared to carbon dioxide.
The RUBISCO enzyme which usually binds the carbon dioxide now binds the oxygen and form the phosphoglycolate and 3 phosphoglycerate. The phosphoglycolate is lost through the Calvin cycle as Carbon dioxide molecule. This loss proves harmful to the plants.
The photorespiration occurs when the plant faces high temperature therefore n order to prevent water loss the stomata gets closed. This result in the binding of the oxygen to the RUBISCO and thus photorespiration begins.
Thus, Option-A is correct.
Cells grown in laboratory culture dishes undergo only a fixed number of division before dying. The number of possible divisions drops depending on the age of the donor organism. This phenomenon is called the
Answer:
Hayflick limit
Explanation:
The Hayflick limit, or Hayflick phenomenon, is the number of times a normal human cell population will divide before cell division stops. It was postulated by Leonard Hayflick in 1961,
In a winter of an epidemic flu, 2000 babies were surveyed by a well-known pharmaceutical company to determine if the company's new medicine was effective after two days. Among 120 babies who had the flu and were given the medicine, 29 were cured within two days. Among 280 babies who had the flu but were not given the medicine, 56 were cured within two days. Is there any significant indication that supports the company's claim of the effectiveness of the medicine?
Final answer:
A preliminary comparison of cure rates indicates a slight advantage for the medicated group over the non-medicated group, but statistical analysis is required to determine significance. The medicine's goal is to manage symptoms, as complete prevention is not typically achievable with current antivirals like oseltamivir.
Explanation:
To assess the effectiveness of the pharmaceutical company's new flu medicine, we can compare the cure rates between the group that received the medicine and the group that did not. In the medicated group, 29 out of 120 babies were cured within two days, giving us a cure rate of approximately 24.2%. In contrast, the non-medicated group saw 56 out of 280 babies cured, which translates to a cure rate of around 20%.
While there is a numerical difference between the cure rates of the two groups, to determine if this difference is statistically significant, a hypothesis test such as Chi-square or Fisher's exact test would usually be conducted. These tests would provide a p-value that, when compared against a chosen significance level (commonly 0.05), would indicate whether the observed difference in cure rates could be due to chance or if it is statistically significant. However, without further statistical analysis, we cannot make a definitive conclusion on the effectiveness of the medicine.
It is also important to note that antivirals like oseltamivir and other medications prescribed for flu symptoms work to reduce symptom duration and inhibit the spread of virus but are not curative. They are part of the recommended treatment protocols for managing flu symptoms along with prophylactic antimicrobials and over-the-counter drugs to alleviate fever and headache.
What are the disadvantages of a flatworms digestive system having
The provided question is incomplete, however the complete question is as follows:
What are the disadvantages of a flatworm's digestive system having only one opening?
Answer:
The correct answer is - cannot consume food continuously .
Explanation:
The main disadvantage of digestive system in the flatworm are one way of opening which is a characteristic feature of many Platyhelminthes phylum organism. This type of digestive system where food enters and exits with the same and only opening available.
In flatworms, once the organism take the food it has to wait for the food to be digested and excreted out by the same opening it use to eat and leave the same opening.
Thus, the correct answer is - cannot consume food continuously.
The question is incomplete. The complete question is as follows:
What are the disadvantages of a flatworm's digestive system having only one opening?
Answer:
The digestive system of the flatworms has been modified depending on their host parasite interaction. They have simple digestive system with the single opening.
This digestive system might have some disadvantages as the food consumption is not continuous due to the single opening. The ingestion and excretion as same opening and this increases the timing of the digestion and excretion process. The energy is expanded more in this type of the digestive system.
A concept that there is a specific time in an organism's development during which external factors have a unique and irreversible impact is:
A. ethology
B. equifinality
C. critical period
D. zone of proximal development
Answer:
C. Critical period.
Explanation:
Critical period:
In developmental biology, ciritical period is also known as sensitive period which is defined as a period or stage of maturation in the organism's lifespan in which nervous system is more sensitive to various environmental stimulus. Means, brain cell connections are more receptive to influence from surrounding environmental factors. Our body's many cruical functions including behavior are established during critical period with irreversible impact.
During a party, Michael was talking to a friend about the symbolism involved in a recent movie. Michael attributed the explanation of the symbolism to a prominent movie critic, when actually he heard it from his roommate. This example illustrates which of the following phenomena?a. Source-monitoring error
b. Serial position effect
c. Cryptomnesia
d. Amnesia
Answer:
a. Source-monitoring error
Explanation:
Source-monitoring error is a phenomenon that refers to a type of memory error in which an individual’s recall of a memory or experience is disrupted leading to incorrect attribution of an experience to an incorrect source. Several factors have been identified to be the cause of this memory error. They include, brain injury, amnesia, depression, aging, high stress level, etc.
Answer:
A. Source-monitoring error.
Explanation:
Source monitoring errors occur when normal memory recall and perceptual processes are disrupted and a memory error occurs. Source monitoring itself is an unconscious mental test that humans perform in order to determine if a memory is "real" and accurate as opposed to being from an extraneous source like a dream or a movie. People use many sources to determine the source of a memory or idea. When a disruption in source monitoring occurs errors in recall can result as a source monitoring error. These occur when a specific recalled experience is falsely attributed to be the source of a particular memory.
In this instance now, Michael was talking to someone about symbolism in a recent movie. Instead of Michael to attributes the explanation to his roommate that told him, he attributed the explanation to a prominent movie critic.
Brian wants to buy a mare which he can breed to help develop a horse-breeding operation. Larson offers to sell Brian a horse which he believes is healthy, and should make a good broodmare when a little older. After two years, the horse has not yet foaled. The veterinarian tells Brian that the horse is incapable of breeding. If Brian sues to rescind the contract with Larson, it is:
Explanation:
Brian was not aware of that fact that the horse is incapable of breeding at the point he buys it, but Larson assures Brian the horse is healthy. In this light, if Brian sues to cancel the contract with Larson, the court will allow it based on a mistake of fact. This way the court will reduce any civil liability or criminal culpability because Larson might not know that the horse cannot breed, although he is certain that the horse is healthyHence, the right answer is "Likely that a court will allow the rescission based on a mistake of fact"Maureen does not seem to take responsibility for her actions (e.g., always creating excuses for coming home past curfew and acting like a victim of teachers when it comes to bad grades). In order for her to take responsibility for her behavior, she needs to become more ____________.A. situation-conscious.
B. self-conscious.
C. self-possessed.
D. condent.
Final answer:
Maureen should become more self-conscious (B), aware of her actions and their consequences, and develop an internal locus of control to take responsibility for her behavior, enhancing her conscientiousness.
Explanation:
In order for Maureen to take responsibility for her behavior, she needs to become more self-conscious. This means she should be more aware of her own actions and their impact, as well as develop an ability to reflect on her behavior. For example, instead of blaming others for her bad grades, like Jane with an external locus of control, Maureen could develop an internal locus of control where she recognizes her role in her academic performance. Developing conscientiousness is also key, as it involves being punctual, following rules, working hard, and being decisive—all traits that support taking personal responsibility.
What are expenditures for assets subsequent to acquisition?
The expenditures for assets subsequent to acquisition are purchase price, incidental expenses and installation charges.
What is expenditure?Expenditure is defined as the entire energy cost of maintaining steady bodily conditions plus the energy cost of physical activities.
It can also be defined as a measurement of the increased energy metabolism required to perform a function.
There are four basic component of expenditure
Resting metabolic rate The thermic effect of foodThe thermic effect of energyAdaptive or facultative or thermogenesisThus, the expenditures for assets subsequent to acquisition are purchase price, incidental expenses and installation charges.
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A patient was exposed to a nerve gas during a chemical warfare attack. The nerve gas inhibited the enzyme acetylcholinesterase. What will happen to the amount of acetylcholine in the synaptic cleft
Explanation:
When ACh is consistently released from the synaptic vesicles into the synaptic split, an expansion in transmitter fixation follows. The serine hydrolase AChE causes a fast hydrolysis of ACh with an exceptionally high response rate prompting the breakdown of ACh and its disposal from the synaptic separatedThis response drastically diminishes the grouping of ACh inside the synaptic split. In this manner, ACh focus rots because of hydrolysis, dissemination and connection to AChR in an exponential fashionThe sensory receptors of the inner ear for equilibrium are
The inner ear structures responsible for equilibrium are the utricle, saccule, and three semicircular canals. They contain hair cells with stereocilia that sense head position and movement. Signals from these structures reach the brain stem and cerebellum via the vestibulocochlear nerve.
Explanation:The sensory receptors of the inner ear responsible for equilibrium, or balance, are primarily located within the vestibule of the inner ear. Specific structures involved are the utricle, saccule, and the three semicircular canals.
Each of these structures plays a distinctive role in maintaining equilibrium: the utricle and saccule help sense head position, while the semicircular canals sense head movement. They contain mechanoreceptors, specifically hair cells with stereocilia, that sense your body's position and motion and send this information to the brain.
The sensory signals generated in these structures are transmitted to the brain via the vestibulocochlear nerve, eventually reaching the brain stem and cerebellum, thereby allowing you to maintain balance and orientation.
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Otolith receptors in the inner ear help detect balance and head movements by transducing signals to the brain.
Otolith receptors are two inner ear vestibular receptors that transduce linear accelerations and head tilt into neural signals for detecting balance. These receptors, located in the utricle and saccule, play a crucial role in maintaining equilibrium. The neural signals from these receptors are transmitted to the brain for interpretation.
The process of straightening an unsaturated fatty acid to create a more solid fat that resists rancidity is called
Answer:
The correct answer is hydrogenation
Explanation:
The process of straightening an unsaturated fatty to produce more saturated and more solid fat is called hydrogenation. In the process of hydrogenation, the hydrogen is added to the liquid unsaturated fats to convert them into solid fat.
Hydrogenation helps in increasing the shelf life of the oil by resisting rancidity. Most of the trans fat in our diet is made from the process of hydrogenation. Fully hydrogenated oil contains a very small amount of trans fat and is better than trans fat which is partially hydrogenated.
Answer:
Hydrogenation.
Explanation:
Two main types of fatty acid are unsaturated fatty acid and saturated fatty acid. The saturated fatty acid has single bond in their structure whereas unsaturated fatty acid has double or triple bond.
The hydrogenation may be defined as the addition of hydrogen molecules to the unsaturated fatty acids that makes them saturated. This process in the presence of palladium that acts as catalyst for the reaction. The increases in saturation level decreases the rancidity as well.
Thus, the answer is hydrogenation.
Do butterflies remember life as a caterpillar?
Answer: Yes
Explanation: They have vivid memories of the cold nights even
Answer:
Yes
Explanation:
Which of the following is the earliest step in transcription? A. RNA polymerase encounters a termination signal, and the DNA molecule is released. B. Complementary RNA nucleotides are synthesized and added to the mRNA molecule. C. Introns are excised from the pre-mRNA strand. D. RNA polymerase binds to the promoter on the template strand of DNA.
Answer:
D.
Explanation:
Transcription is the first step in gene expression. It involves duplicating a gene's DNA sequence to make an RNA molecule.
It is performed by enzymes called RNA polymerases, which link nucleotides to form an RNA strand (using a DNA strand as a template)
Answer: D. RNA polymerase binds to the promoter on the template strand of DNA.
Explanation: The first step in transcription is termed initiation step. In this step, the enzyme RNA polymerase binds to a region or section of a gene called the promoter. This specific action results to the signalling of the DNA to unwind so the enzyme can decode the bases in the DNA strands. The enzyme now make a strand of mRNA with contemporary bases.
Overactive sebaceous glands can cause:________a) fine hairs on the forehead to become brittle. b) the forehead's skin to become dry. c) bacteria on the forehead's skin to grow and multiply freely. d) seborrhea, a disease characterized by red, itchy lesions on the scalp.
Answer:
d) seborrhea, a disease characterized by red, itchy lesions on the scalp.
Explanation:
Sebaceous gland are the glands which are usually present beneath the skin and with the hair follicles. They are also known as oil-producing glands as they released sebum.
If the sebaceous gland becomes too active and secrete extra sebum than it can cause a condition called Seborrhoea. In Seborrhoea microbe like Malassezia fungi species colonizes the area where sebum is produced and initiates local inflammatory response which causes scaly patches, itchy lesions, and red skin. So the correct answer is d.
Overactive sebaceous glands primarily cause seborrhea, which is characterized by red, itchy lesions on the scalp. The glands produce excessive sebum resulting in this condition, while options a, b, and c are not direct consequences of overactive sebaceous glands.
Explanation:Overactive sebaceous glands in the skin can lead to various outcomes, but the most corresponding answer to this question is option d) seborrhea, a disease characterized by red, itchy lesions on the scalp. The sebaceous glands produce an oily substance called sebum, which plays a critical role in the protection and nourishment of skin. However, when these glands become overactive, they generate excessive amounts of sebum. This excess sebum can result in a condition known as seborrhea, displaying symptoms of redness, itchiness, and flaky skin particularly on the scalp. Options a, b, and c are not direct effects of overactive sebaceous glands.
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The half-life of Carbon-14 is 5730 years. Suppose a fossil is found with 50% of Carbon-14 as compared to a living sample. How old is the fossil?
Answer:
5732 years
Explanation:
Radioactive decay can be determined by using the equation:
[tex]N_t = N_0e^{- \lambda t}[/tex]
where;
[tex]N_t[/tex] = number of decayed atoms at time (t)
[tex]N_0[/tex] = initial number of decayed atoms
[tex]\lambda[/tex] = decay constant
So, if we equate the natural log of the above; we have:
[tex]In(N_t) = In(N_0)-\lambda t[/tex]
[tex]\frac{In(N_t)} { In(N_0)}} = -\lambda t[/tex]
where;
[tex]\lambda[/tex] = [tex]\frac{0.693}{t_{1/2}}[/tex]
[tex]\lambda[/tex] = [tex]\frac{0.693}{5730}[/tex]
[tex]\lambda[/tex] = [tex]1.209*10^{-4[/tex]
[tex]In(\frac{50}{100}) =-(1.209 *10^{-4})*t[/tex]
[tex]-0.693 = -(1.209*10^{-4})*t[/tex]
[tex]t= \frac{0.693}{1.209*10^{-4}}[/tex]
t = 5732.01 years
t = 5732 years.
Hence, the fossil is 5732 years old.
Answer: 5730 years
Explanation:
Because it takes 5730 years for half of a sample of carbon-14 atoms to decay. It says that 50% of the carbon atoms have decayed so that means that 5730 years have elapsed for that fossil.
mutations can cause a change in a gene allele, which can be harmful. ocasionally mutations can be beneficial. some changes however are 'silent', i.e. they dont cause a change in the trait. explain how this is possible.
Answer: They replace the original amino acid with the same or a chemically similar amino acid
Explanation:
If for instance: glutamate is replaced by aspartate in a polypeptide chain, then the mutation is called 'silent' because both glutamate and aspartate are acidic amino acids, hence it does not result in a change of the amino acid sequence of the protein.
When sperm and egg cells undergo meiosis, the number of chromosomes goes from ______ to _______. When an egg is fertilized by a sperm cell that number goes from ______ to ______. 2 to 2; 1 to 1 1 to 1; 2 to 2 1 to 2; 2 to 1 2 to 1; 1 to 2
Final answer:
The number of chromosomes in sperm and egg cells goes from diploid (46) to haploid (23) during meiosis. Upon fertilization, these haploid cells merge to form a diploid zygote with 46 chromosomes. The correct sequence is 2 to 1; 1 to 2.
Explanation:
When sperm and egg cells undergo meiosis, the number of chromosomes goes from diploid (2n) to haploid (n). Specifically, the number goes from 46 to 23 chromosomes in humans. When an egg is fertilized by a sperm cell, this number goes from haploid to diploid, or from n to 2n, effectively from 23 to 46 chromosomes. Therefore, the correct sequence of numbers from the options provided is 2 to 1; 1 to 2.
During this process, DNA is copied once, and then the cell divides twice, leading to gametes with half as much genetic information as the original cell. Upon fertilization, the gametes unite and the original number of chromosomes is restored in the zygote, which now contains the full complement of genetic information necessary for the development of a new organism.
Adult male humans generally have deeper voices than do adult female humans, which is the direct result of higher levels of testosterone causing growth of the larynx. If the fossil records of apes and humans alike show a trend toward decreasing larynx size in adult females and increasing larynx size in adult males, then _________.a. sexual dimorphism was developing over time in these speciesb. intrasexual selection seems to have occurredc. stabilizing selection was occurring in these species concerning larynx sized. selection was acting more directly upon genotype than upon phenotype
Answer:
a. sexual dimorphism was developing over time in these species
Explanation:
Sexual dimorphism is an evolutionary change that occurs over time in species, which could be as a result of sexual selection which makes both sex of a species develop a systematic difference in form, which can manifest in terms of body size, color, secondary sex characteristics, and size of some structures such as larynx size which accounts for deeper voices in males in relation to levels of testosterone. This is later passed across from generation to generation over time.