Answer:
Simply saying it is cross that involves two traits
Explanation:
In dihybrid cross the phenotypes of two genes are followed through the mating of individuals which carry multiple alleles at those gene loci. In other words, two genes controlling two different phenotypic traits are observed in dihybrid cross.
"Dihybrid cross",means
"di" indicates that there are two traits involved for example A and B and
"hybrid" indicates that each trait has two different allele, for example A and a or B and b.
A dihybrid cross is a genetic cross between two individuals that are heterozygous for two different traits.
In genetics, a dihybrid cross examines the inheritance patterns of two traits simultaneously. Each parent in the cross is heterozygous for both traits, meaning they possess two different alleles for each trait. The purpose of a dihybrid cross is to determine the probability of offspring inheriting various combinations of these traits, and it often follows Mendel's laws of independent assortment, which state that the alleles for different traits are distributed to sex cells (and offspring) independently of one another.
During _____ both the contents of the nucleus and the cytoplasm are divided.
During the mitotic phase
The male gametophytes of flowering plants are also referred to as _____.male sporophytes,embryo sacs,endosperm,pollen grains,megaspores
Answer:
pollen grains
Explanation:
Pollen grains are structures in the seed plants (spermatophytes) which contain vegetative cells but also reproductive cells - microgametophytes. Microgametophytes produce 2 male gametes or sperm cells. Vegetative cells produce pollen tube which is involved in the transfer of sperm cells to the ovule (female structure that forms female gametes). Pollen grains are different in shape, size and color, but all of them are enveloped with hard coat that has protective role.
Answer:
Pollen grains
Explanation:
Pollen grains are make gametophytes
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Describe what you first see when you open the body cavity of the frog. What organs are obvious? Which organs may require a more thorough inspection?
Answer:
urinary bladder, large intestine, stomach, small intestine, right lung
The Chesapeake Bay is an important natural resource. Over the years, the number of oysters in the bay has declined dramatically, largely because of fishers who catch them and sell them as food. This has affected many other organisms that depend on oysters. This is an example of which type of short-term human-induced environmental change?
A.eutrophication
B.non-sustainable harvesting
C.nonnative species introduction
D.pollution
Answer: B. Non-sustainable harvesting.
Explanation:
Non-sustainable harvesting is a practice in which the resources are consumed in a way that not appreciable amount is left. This is a short term human induced environmental change. Such a change may last for a short period of time and the damge caused by the change will be recovered by the environmental conditions.
The oyster population which is being overexploited due to non-sustainable harvesting by fishing and depleted will recover in future with the few remaining members of the population. Hence, it is a short term human induce change.
Testosterone is synthesized primarily by the
Testosterone is synthesized primarily by the Leydig cells.
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Which statement describes ozone?
A.
It forms a part of the upper atmosphere known as the ozone layer.
B.
It is a type of oxygen that is milky white in color.
C.
It consists of five oxygen atoms, making it a highly reactive molecule.
D.
A single ozone molecule can stay in the atmosphere for 100 years before it gets destroyed naturally.
A. It forms a part of the upper atmosphere known as the ozone layer.
A. Ozone forms a part of the upper atmosphere known as the ozone layer is the right statement to describe ozone.
What is ozone?Ozone is a layer of the stratosphere that contains protective gases around the planet.
This layer is most important for the earth to prevent itself from global warming.Depletion of the ozone layer can cause the greenhouse effect.Global warming can cause the melting of glaciers, scarcity of water, etcThe reasons for the depletion of the ozone layer include the use of aerosols and CFC-releasing appliances like air conditioners and refrigerators.Hence, option A is the right answer.
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One serving of chunk light tuna in water contains 0.5 g of fat. the total food calories in one serving is 60. what percentage of calories come from fat?
Answer:
approximately 4.5
Explanation:
According to https://healthyeating.sfgate.com/gram-protein-carbohydrates-contains-many-kilocalories... , there is 9 calories per 1 gram of fat, therefore there is 4.5 per .5 gram.
Which of the following statements correctly describes the effect a nonsense mutation would have on a gene?a) It changes an amino acid in the encoded protein.b) It alters the reading frame of the mRNA.c) It introduces a premature stop codon into the mRNA.d) It has no effect on the amino acid sequence of the encoded protein.
C. It introduces a premature stop codon
The nonfunctional pelvis and hind limbs found in some snakes support which statement about evolution?
a) Snakes began to evolve these structures, but selection pressures did not favor them.
b) Mutations tend to make species evolve to resemble other species in their environment.
c) Snakes evolved from the same common ancestor as species in which these structures are functional.
d) Selection pressures promoting snake evolution ceased before snake anatomy was well adapted.
Answer:
The answer is C. Snakes evolved from the same common ancestor as species in which these structures are functional.
Explanation:
The organs which apparently have no functional role in an organism but thought to be functional in past are called Vestigial Organs. One common example is the non functional Pelvis and hind Limbs in snakes. It is thought that snakes have evolved from reptiles. From fossil record it was predicted that many snakes like species were present in past and they had the pelvic bones while due to adaptation to the changing environment they lost the functional bones and evolved as snakes.
Antibodies are proteins produced by lymphocytes as a result of an immune response. The antibodies can fight
a.only viral infections.
b.only bacterial infections.
c.both viral and bacterial infections.
d.neither viral nor bacterial infe
Answer:
C
Explanation:
because anti-bodies help to protect the body
Answer:
Antibodies can only fight bacterial infections.
Explanation:
Antibodies can not fight both bacterial infections and viral infections. Only Vaccines can fight both.
Each replication fork requires both leading and lagging strand synthesis because
Think of it as a zipper. The top zipper is the leading strand, the bottom is the lagging, and the actual zipper thing is the helicase unwinding the 2 parts. You need the top and bottom strands to have a replication fork
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1. Which of the following best explains the relationship between science and ethics?
A. There is no relationship between science and ethics
B. Every scientific question raises serious ethical concerns
C. Scientists should try and avoid ethical questions because they limit research
D. Science provides facts and ethics determines how to best use the information
2. The first European to cross the Atlantic ocean were?
A. Greeks
B. Italians
C. Vikings
D. Spanish
3. Which of the following best describe captain James cooks contribution to marine science?
A. Proving that humans were harming the ocean
B. Documenting the islands in the Atlantic for the first time
C. Creating records of marine life as he explored new regions
D. Requiring all ships in the navy to have a marine scientist on board
Answer:
1. The best statement is Science provides facts and ethics determines how to best use the information
2. The first European to cross the Atlantic ocean were Italians.
3. Captain James Cook created records of marine life as he explored new regions
Explanation:
1. Science and ethics are compulsory for each other. A scientific study without ethical consideration is not significant. Implications of all the information we get by science are determined by ethics.
2. Christopher Columbus an Italian was the first European to cross the Atlantic Oceans. He started his journey from Spain and accidentally discovered America.
3. Captain James Cook contributed to the marine sciences during his voyages by creating records of marine life as he explored new regions.
Answer:
1. D. Science provides facts and ethics determines how to best use the information
2. C. Vikings
3. C. Creating records of marine life as he explored new regions
Explanation:
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Centromeres of sister chromatids disjoin and chromatids separate. Which phase does this event happen?
Answer:
Anaphase
Explanation:
Cohesin is a protein that holds sisters chromatids together. Anaphase begins with the cleavage of that protein, enabling centromeres to split, and the movement of sister chromatides (new daughter chromosomes) toward the poles.
During the anaphase, microtubules that are not attached to chromosomes elongate and push apart. This elongation makes the cell longer and separates the poles.
What type of cell makes up the myelin sheath of a motor neuron?
Answer:
glial cells <3
Explanation:
Claytonia virginica is a woodland spring herb with flowers that vary from white to pale pink to bright pink. Slugs prefer to eat pink-flowering over white-flowering plants (due to chemical differences between the two), and plants experiencing severe herbivory are more likely to die. The bees that pollinate this plant also prefer pink to white flowers, so that Claytonia with pink flowers have greater relative fruit set than Claytonia with white flowers. A researcher observes that the percentage of different flower colors remains stable in the study population from year to year. Given no other information, if the researcher removes all slugs from the study population, what do you expect to happen to the distribution of flower colors in the population over time? 22.2
Answer:
Over time, the plants will eventually all be pink because bees are more likely to pollinate the pink plants meaning the white plants are less likely to survive
Explanation:
Without the predation pressure from slugs, the pink-flowered Claytonia virginica is likely to increase in frequency due to higher survival and reproductive success, as bees prefer and more effectively pollinate these flowers.
If the researcher removes all slugs from the study population of Claytonia virginica, a woodland spring herb, we can expect the distribution of flower colors to change over time. Since slugs prefer to eat pink-flowering plants, their removal would likely reduce the herbivory pressure on these plants. Given that bees prefer pink flowers and that pink flowers have a higher relative fruit set, in the absence of slug predation, pink-flowering individuals would potentially have higher survival and reproductive success compared to white-flowering individuals. This would lead to an increase in the frequency of pink-flowered plants in the population over time.
While _________ involves a splitting off of parts of the personality,_________ involves the existence of multiple, intact personalities within one individual?
Answer:
b
Explanation:
Parasympathetic antagonists would stimulate gastrointestinal motility. True or False
the answer should be false
Calcium is necessary to initiate muscle contraction. Which of the following molecules binds calcium?A. tropomyosinB. troponinC. actinD. myosin
Answer:
b. troponin
Explanation:
Troponin is a globular protein present in striated muscle, cardiac muscle and skeletal muscle.
This protein is constituted by troponins T, I and C
The subunit C (Tn C) is the one that is responsible for binding Ca2 + calcium ions (each mole of protein binds two mole of Ca2 +).
Disorders of which organelle are often associated with defects in transport from compartment to compartment, resulting in poor sorting of protein components within the cell?nucleusendoplasmic reticulumplasmidsplasma membranethe Golgi apparatus
Answer:
The correct option is GOLGI APPARATUS.
Explanation:
The Golgi apparatus is the cell organelle that is responsible for transporting, modifying and packaging of synthesized proteins for delivery at specific locations, which may be inside or outside the cell. The number of Golgi apparatus that can be found in different cells differ greatly. Disorders of Golgi apparatus are usually associated with defects in proteins transportation, sorting and packaging.
Which of these diagrams best shows Kepler's model of the solar system?
Hi.
I believe the diagram that best shows Kepler's model of the solar system is the picture B, the sun is the center while the earth (and other planets) orbit in an equantless pattern
Answer:
Option D
Explanation:
According to the Kepler, the arrangement of solar system is heliocentric which means that the sun is at the centre and all other planet rotate around it.
As per Kepler’s first law - All the planet rotate around the sun in elliptical paths
As per Kepler’s second law - The radius vector wrt position of planet on elliptical orbit sweeps equal area.
As per Kepler’s third law - The cubes of the planets mean distances from the Sun is directly proportional squares of the sidereal periods
As per Kepler , the solar system arrangement would look like a way more similar to as shown in the option D
The growing polypeptide chain is inserted into the membrane of the blank before being sent to its final destination
endoplasmic reticulum
The result of the following cross indicates the orange eyes are _____ black eyes.
the answer is recessive to.
The orange eyes in the fruit fly cross are recessive to black eyes. A cross between a white-eyed male and a heterozygous red-eyed female results in a 1:1 ratio of red to white-eyed offspring for both sexes.
Explanation:The result of the cross indicates that orange eyes are recessive to black eyes. In Drosophila (fruit flies), eye color is often used as an example of a sex-linked trait. In a cross between a homozygous red-eyed female fruit fly and a white-eyed male fruit fly, the expected outcome for the F1 generation would be all red-eyed offspring since red is dominant over white.
However, a cross between a white-eyed male (XY) and a female heterozygous for red eye color (XwXw) would result in different phenotypes for the different sexes: 50% of the female offspring would be heterozygous with red eyes, 50% of the female offspring would be homozygous with white eyes, 50% of the male offspring would have red eyes (hemizygous dominant), and 50% would have white eyes (hemizygous recessive), giving a 1:1 ratio of red to white eyes for both sexes.
What type of symmetry did your starfish have
Answer:
An adult starfish has radial symmetry
Explanation:
The starfish (and all echinoderms) start out with bilateral symmetry (which is like humans who have 2 symmetrical halves) during their larval stage. However, during metamorphosis they lose this bilateral symmetry and develop some kind of radial symmetry (5 identical parts).
most starfish have pentaradial symmetry, which means that they have five arms that radiate out from a central disk.
How do we explain?pentaradial symmetry is a type of symmetry is common in echinoderms, which are a group of animals that includes starfish, sea urchins, and sea cucumbers.
There are a few exceptions to this rule. For example, some starfish have six arms, and others have even more. There are also some starfish that have lost their arms altogether. However, pentaradial symmetry is the most common type of symmetry in starfish.
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However, some organisms get all of their genetic material from just one parent organism. When this happens, this is called _______ reproduction.
Asexual reproduction
Answer: asexual
Explanation: In asexual reproduction, all of the genes that an organism carries come from just one parent. This ordinarily happens when the parent organism simply divides to create offspring. Microscopic bacteria and yeasts undergo asexual reproduction.
Identify three limiting factors that can prevent a population from increasing. Explain how each factor limits a population's size
Answer:
natural disasters,emigration and scarcity of food
Explanation: natural disasters: this affect population where by organisms leave there area or habitat for another area due to unfavorable conditions eg. flood, bush fire, storms, earthquake etc. and can also lead to death.
Emigration:this is when organisms leave an area for another either in search of food, breeding purpose this reduses population where by organisms may never return.
scarcity of food:this occur when there is insufficiency or no food in an area which makes organisms leave their habitat for another in search of food and might even lead to death.
What type of cells tend to be damaged the most during chemotherapy and radiation treatments?
a. collagen and fibrous tissue
b. epithelial cells
c. nerve tissue
d. skeletal muscle cells?
c
you can notice that from many cases
Epithelial cells are the type of cells that are most prone to damage during chemotherapy and radiation treatments. This is due to their fast dividing nature, similar to cancer cells. While these treatments can harm healthy cells, they usually recover over time.
Explanation:The type of cells that tend to be damaged the most during chemotherapy and radiation treatments are b. epithelial cells.
Epithelial cells are the cells that line the surfaces of organs and structures throughout the body. They divide and replicate quickly, just like cancer cells. It is for this reason that they are more prone to be affected by chemotherapy and radiation therapies, as these treatments target fast-dividing cells.
Note that while chemotherapy and radiation therapies are effective in killing cancer cells, they also harm healthy cells, leading to side effects. However, healthy cells usually can recover from this damage over time.
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Which of the following would most likely increase the rate of photosynthesis?
A. Changing a plant's light source to a lower brightness
B. Decrease the availability of water to the plant
C. Decreasing the temperature within the plant's environment
D. Exposing a plant to a higher light intensity
Answer:
D. Exposing a plant to a higher light intensity
Explanation:
Increase in light intensity serves to increase the rate of photosynthesis when other factors are present in adequate amount. It is due to the fact that the first phase of photosynthesis includes light dependents reactions that results in synthesis of ATP and NADPH in light dependent manner. These two products serve in dark phase of photosynthesis. Therefore, increase in light intensity increases the rate of photosynthesis.
Option D, exposing a plant to a higher light intensity, is most likely to increase the rate of photosynthesis as light provides the necessary energy for the photosynthesis reaction to occur. Other factors like water availability and temperature also influence photosynthesis but in this case, their decrease could potentially slow down the process.
Explanation:In terms of photosynthesis, the process through which green plants and some other organisms convert light energy, usually from the Sun, into chemical energy for their growth and survival, one of the key ingredients is light. The intensity of this light can greatly affect the rate of photosynthesis. So, among the options provided,
D. Exposing a plant to higher light intensity
is likely to increase the rate of photosynthesis. This is because light provides the energy required for the photosynthesis reaction to occur.
Conversely, decreasing light intensity (option A), decreasing the availability of water (option B), or lowering environmental temperature (option C) could potentially slow down the process. For instance, in low light conditions or shade, a seedling may not have enough light to promote sufficient photosynthesis. The rate of photosynthesis can also fall when water or optimal temperature levels are inadequate, as these conditions may lead to the closure of stomata, resulting in a constrained intake of carbon dioxide, a key reactant in photosynthesis.
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NEED HELP!! Which of the following describes the most likely impact that exposure to pollutants in the atmosphere would have on one’s personal health?
It would stop cell-mediated immune responses.
It would lead to upper respiratory infections and pneumonia.
It would increase the release of red blood cells.
It would decrease one’s ability to produce antibodies.
Answer:
I think it would lead to upper respiratory infections and pneumonia is the right answer
Explanation:
It would be the second one down because if you consider places like china where they have super low air quality due to high pollution they tend to have upper respiratory issues which is why many of them wear masks.
A population of rodents, called population A, lived together in harmony on a large landmass until one group of the population dispersed to a nearby island. Two million years later, the island population is split into two smaller, equal-sized populations when a river formed across the middle of the island. Now two new species have evolved on the island, A1 and A2. They have replaced the population from which they were derived. Which represents the phylogeny of the three extant species discussed in this scenario?
Answer:
Diagram K is the answer
Final answer:
The three extant rodent species, originating from population A, underwent allopatric speciation leading to species A1 and A2. This occurred due to habitat isolation and selective pressures. The phylogeny would show a divergence first between the mainland and island populations, then another split between A1 and A2 after a river separated them.
Explanation:
In the given scenario, allopatric speciation has occurred within a population of rodents, known as population A, leading to the evolution of two new species, A1 and A2. Initially, part of population A dispersed to a nearby island, separating them from the mainland population. Due to habitat isolation, the island population ceased reproduction with the mainland population and began to independently evolve. After two million years and the introduction of a river splitting the island habitat, the island population divided into two, preventing gene flow between the two groups.
This geographical separation instigated further allopatric speciation, resulting in the formation of two distinct species, A1 and A2. The phylogeny of these rodent populations would reflect their shared ancestry and subsequent divergences. Initially, population A from the mainland would be at the base of the phylogenetic tree. The branch then separates into the island population, which later bifurcates into two distinct branches representing species A1 and A2 after the formation of the river.
Lisa, a beginning marathon runner, trains in hot (80 degree), humid conditions. her third marathon occurs in hot (80 degree), dry conditions. while running, she consumes the same amount of water as she does in her previous races. close to the finish line, she gets a headache and collapses in seizures and slips into a coma. which hypothesis best fits what happened to lisa?
Answer: AND Explanation.
Lisa consumed too much water in too short of a time. This led to water leaking into the brain and disrupting the cerebrospinal fluid concentrations, impairing neural tissue activity
Lisa gets a headache, collapses in seizures, and slips into a coma, so based on the information provided, the most likely hypothesis for what happened to Lisa is that she experienced heat stroke, as presented in Option A.
What is heat stroke?Heat stroke is a serious and potentially life-threatening condition that occurs when the body's temperature regulation mechanisms fail, can happen when a person exercises in hot and humid conditions, in Lisa's case, she was used to training in hot and humid conditions, but her third marathon occurred in hot and dry conditions. Lisa's collapse, seizures, and slip into a coma suggest that her body temperature had risen to a dangerously high level, so she must be treated.
Hence, based on the information provided, the most likely hypothesis for what happened to Lisa is that she experienced heat stroke, as presented in Option A.
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The question is incomplete, complete question is below
Lisa, a beginning marathon runner, trains in hot (80 degree), humid conditions. her third marathon occurs in hot (80 degree), dry conditions. while running, she consumes the same amount of water as she does in her previous races. close to the finish line, she gets a headache and collapses in seizures and slips into a coma. which hypothesis best fits what happened to lisa?
a)heat stroke
b)homeostasis