Answers
Answer:
Statement 1: Homologous chromosomes line up at the equator in pairs.
Name of Phase: Metaphase 1
Sequence: 3
Statement 2: The cell replicates its chromosomes
Name of Phase: S-Phase, Interphase
Sequence: 1
Statement 3: Homologous chromosomes separate and move to opposite poles of the cell
Name of Phase: Anaphase 1
Sequence: 4
Statement 4: Spindle forms, DNA coils up in homologous chromosomes come together in a tetrad; crossing over may occur.
Name of Phase: Prophase 1
Sequence: 2
Statement 5: Events occur in reverse order of prophase 1
Name of Phase: Telophase 1
Sequence: 5
Explanation:
Following is a summary of the events of meiosis:
1. Interphase:
Prepares the cell for division. Duplication of DNA, duplication of centrioles occurs and the cell grows in size. At this stage the cell is diploid (2n).
2. Prophase 1:
First stage of Meiosis 1.The centrioles move to the poles of the cell, the nuclear membrane disintegrates, homologous chromosomes pair up (in the form of tetrad), form a chiasmata and then exchange segments of chromosomes with each other. This process is called crossing over.
3. Metaphase 1:
Involves the arrangement of the crossed over, homologous chromosomes on the metaphase plate which is sort of like a web of spindle fibers that originates from the centrioles.
4. Anaphase 1:
The tetrads arranged on the metaphase plate are pulled apart by the spindle fibers. This is the result of tension that build up in the spindle fibers as they grow towards opposite poles.
5. Telophase 1:
The last stage of meiosis 1. Involves the arrival of the chromosomes at the poles, the nuclear membrane starts to form and the chromosomes start decondensing. Telophase 1 yields 2 daughter cells with half the number of chromosomes as that in the parent cell.
Meiosis 2:
Meiosis 2 is exactly similar to mitosis. The only difference is that the haploid cells entering meiosis 2 do not duplicate their DNA. Meiosis 2 just involves the separation of the sister chromatids of homologous chromosomes.
As mentioned above, interphase does not occur before meiosis 2.Prophase 2 involves the disintegration of nuclear envelope, centrosomes start moving to the poles.Metaphase 2 arranges the chromosomes on metaphase plate.Anaphase 2 separates the sister chromatids from the chromosomes.Telophase 2 develops the nuclear envelope and separates the nuclei of the daughter cells into 2. Nuclear division id followed by cytokinesis (division of cytoplasm). Telophase 2 result sin 4 haploid daughter cells with one chromatid from each chromosome.Related Questions
What is the impact of exposure to violence on development during middle childhood? How can exposure to violence play a role in bullying? Have you been a victim of bullying or a bully yourself? What is the best way to combat bullying?
Answers
Answer:
The exposure of a child with violence have been seen to have a number of negative influences on the child. One of these negative influences is the influence in the adaptability of the child and his academic success. Children who encounter violence are mainly subjected to low academic performance and have difficulty in adapting to schools. The exposure to violence disturbs the cognitive functioning of the child.
Children who are often depressed encounter more bullying from other people. The best way to combat bullying is to ask assistance from a higher authority such as a teacher.
Which is a policy designed to reduce water contamination
Answers
Answer:
Treatment of industrial effluents through the extraction of pollutants before discharge to the rivers
Explanation:
Water contamination is the addition of undesirable materials into rivers, lakes and other bodies of water. Polluted water is unclean and unsafe to use therefore policies are designed to reduce water contamination that possesses risk to human health.
Complete the sentence: Ecosystem distribution
is related to altitude; regions at high elevations
are cold and therefore
Answers
Answer:
Hypotheses may vary. Most students will probably state that ecosystems at
high altitudes will support little vegetation.
Explanation:
Ecosystem distribution is different at different places. Regions at high elevations might usually have low varieties of plants and animals but it cannot be true for every ecosystem located as higher altitudes.
Some communities might be well adapted to live in the cold and hence progress rapidly.
Ecosystem distribution varies with altitude. High-altitude regions are cold and therefore have species adapted to such conditions, like pine trees and snow leopards. In contrast, low-altitude regions offer a more temperate climate, thus hosting a wider diversity of species.
Explanation:Ecosystem distribution is related to altitude. Regions at high elevations are cold and therefore, host different types of flora and fauna than those at low elevations. Whether it's the extreme conditions of a mountaintop or the lush, verdant growth at sea level, the ecosystem distribution varies significantly with altitude.
Plants that can survive freezing temperatures, snow, and high winds, such as pine trees and snow leopards, thrive in high-altitude areas. Similarly, animal adapt differently to high altitudes. For instance, snow leopards have thick fur and long tails for insulation against the cold, and yaks have large lungs to accommodate the thin air. In contrast, the low-altitude ecosystems feature a broader diversity of species, as they offer a more temperate climate.
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Cleavage is chick is called discoidal type,why?
Answers
Answer; Explanation:
In chicks, the pattern of cleavage is oftentimes referred to as the discoidal because it is entirely associated with the circular disc found in the blastodisc- the cytoplasm. So when during cleavage process, the cells that arise are known as blastomeres which then collectively form the blastoderm.
What would happen if diploid organisms reproduce by sexual reproduction without first producing sex cells through meiosis?
Answers
If no meiosis takes place chromosome number will be doubled disturbing the genetic make up of the organism.
Explanation:
If no meiosis takes place then the resulting zygote will be of double the number of chromosomes. The genetic makeup will change entirely. The process of meiosis halves the number of chromosomes in haploid cell and maintain the serenity of organism.
The process of meiosis due to crossing over, genetic variation occurs which let the offspring receive favourable alleles to survive in new conditions.
In diploid organisms first the gametes are formed, then fertilization occurs and the diploid cell is formed which gives rise to the organism having diploid cells.
What are the two main sources of energy in the water cycle?
Question 1 options:
gravitational energy and thermal energy
gravitational energy and mechanical energy
hydro energy and gravitational energy
kinetic energy and thermal energy
Answers
Answer:
hydro energy and gravitational energy
Explanation:
Plants were grown in two different conditions. The plants on the left were grown with all essential nutrients required for plant development. The plants on the right were grown in a nitrogen-deficient medium. What best differentiates the abilities of the plants on the left and the right to synthesize molecules?
Answers
The main difference between the plants grown in different conditions lies in their ability to synthesize molecules, such as chlorophyll and proteins. Nitrogen, a crucial macronutrient, plays a key role in these processes. The deficiency of nitrogen can hinder plant growth, but some plants can adapt by forming symbiotic relationships with nitrogen-fixing bacteria.
Explanation:
The pivotal difference between the plants grown with all essential nutrients and those grown in a nitrogen-deficient medium is their ability to synthesize molecules essential for growth and development. Nitrogen is a key macronutrient involved in the formation of amino acids, proteins, and nucleic acids in plants. Its deficiency can significantly hamper a plant's growth.
For instance, the plants receiving ample nutrients would be able to synthesize chlorophyll effectively thanks to the availability of elements like nitrogen. On the other hand, nitrogen-deficient plants may face stunted growth and display symptoms like yellowing of leaves (chlorosis) due to reduced chlorophyll synthesis. This inability to synthesize essential molecules as a result of nitrogen deficiency hinders the overall development and growth of the plant.
However, plants have a unique ability to adapt to nitrogen-limiting conditions. Many plants form symbiotic relationships with nitrogen-fixing bacteria, such as agrobacterium, which can convert atmospheric nitrogen into a form usable by plants, thereby indirectly aiding in molecule synthesis despite the limited nitrogen supply in the medium.
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the production of haploid(N) gametes is the main purpose of __________.
Answers
Answer: Meiosis
Explanation: There two types of cell division: Meiosis and mitosis. Meiosis occurs in sex cells otherwise called gametes. In meiosis, a single cell divides two times to produce four daughter cells with haploid number of chromosomes i.e., half the number of chromosomes in the parent cell.
What equipment should they use to MOST efficiently test the pH of the water and record this data? A) litmus paper and a notebook B) pH probe hooked up to a computer C) pH paper and an excel spreadsheet D) pH probe and a graphing calculator
Answers
B) pH probe hooked up to a computer
Answer:
C. pH paper and an excel spreadsheet.
Explanation:
The reason for this is that the pH paper will change colors when it is put in water, and the spreadsheet is great for taking data notes.
what is the phenotypic ratio that results from a dihybrid cross between two organisms and that are heterozygous for both traits
Answers
Answer:
The phenotype ratio predicted for dihybrid cross is 9:3:3:1.
Explanation:
A dihybrid cross tracks two traits. Both parents are heterozygous, and one allele for each trait exhibits complete dominance *. This means that both parents have recessive alleles, but exhibit the dominant phenotype. (Sorry if i Misspelled some words)
Final answer:
The phenotypic ratio from a dihybrid cross between two heterozygous organisms is typically 9:3:3:1, calculated using a Punnett square. This ratio applies when traits are independently assorted and show complete dominance. Deviations can occur with different interactions such as epistasis.
Explanation:
The phenotypic ratio that results from a dihybrid cross between two organisms that are heterozygous for both traits is typically 9:3:3:1. This ratio emerges from crossing individuals with the genotype AaBb x AaBb, where 'A' and 'a' represent the alleles of one gene, and 'B' and 'b' represent the alleles of a second gene. Both traits are independently assorted and show complete dominance.
To calculate the ratio, you would use a Punnett square to predict the genotype of their offspring. The resulting phenotypic ratio is:
9 showing both dominant traits (A-B-)3 showing the first dominant trait and second recessive trait (A-bb)3 showing the first recessive trait and second dominant trait (aaB-)1 showing both recessive traits (aabb)If there are deviations due to different assumptions about the phenotype of allele 'b' or other gene interactions, such as epistasis, the phenotypic ratio could be modified to 9:3:4, 12:3:1, 9:7, or 15:1.
Which of the following must be met for a scientifically valid sample? Subjects are selected:
Check ALL that apply
A. To represent the population
B. Based only on who volunteers
C. From the most conveniently available people
D. At random
Answers
Answer:
The correct answer is: A. and D.
Explanation:
In order to scientifically validate a sample, it is necessary that,The entire population under study should be considered to obtain an average or a mean data. If only a part of the population is considered then the result obtained would be a biased one. A biased data will not represent the entire population and so it would be incorrect.The sample choice done must be at random covering all the areas of the population to get the accurate result. This is because random selection lowers the possibility of getting biased.
A scientifically valid sample must be representative of the population, not based on who volunteers or conveniently available people, and should be selected at random. The correct option is A and D.
Explanation:To ensure a scientifically valid sample, subjects should be selected to represent the population, meaning they are a true reflection of the entire population. Selecting subjects based only on who volunteers or from the most conveniently available people may introduce bias into the sample. The best practice for selecting a scientifically valid sample is to choose subjects at random, which means every member of the population has an equal chance of being selected.
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Which physical property is best measured using only a balance?
O
A. Density
O B. Volume
O C. Mass
O D. Color
SUBMI
Answers
Answer:
Which physical property is best measured using only a balance?
C. Mass
Answer:
Explanation:
Mass. Took test.
What symptom would you expect a patient whose large intestine is not
functioning properly to show?
A. Dehydration
B. Extreme hunger
C. Vomiting
D. Constipation
Answers
Final answer:
A patient with a malfunctioning large intestine is most likely to show symptoms of dehydration due to the inability of the intestine to properly reabsorb water, leading to chronic, watery diarrhea.
Explanation:
Symptoms of Improper Large Intestine Function
When a patient's large intestine is not functioning correctly, one major symptom they may exhibit is dehydration. The large intestine is primarily responsible for water reabsorption. If it is not working properly, the body may not reabsorb enough water, leading to frequent, watery diarrhea, which can further aggravate dehydration. This is in contrast to constipation, which occurs when too much water is reabsorbed, causing the feces to harden. While vomiting can cause dehydration, it is not primarily associated with large intestine dysfunction, and extreme hunger is not typically a direct symptom of large intestine issues. Therefore, the expected symptom for a patient with a malfunctioning large intestine is A. Dehydration.
The correct symptom that one would expect a patient whose large intestine is not functioning properly to show is:
D. Constipation
The large intestine plays a crucial role in the digestive system, primarily responsible for absorbing water from the remaining indigestible food matter and forming stool. When the large intestine is not functioning properly, it can lead to a variety of symptoms, the most common of which is constipation. Constipation occurs when the colon absorbs too much water, or if the muscle contractions in the colon are slow or sluggish, making the stool hard and difficult to pass.
Let's consider the other options:
A. Dehydration - While dehydration can be a symptom of various conditions, it is not directly related to the large intestine's function in forming stool. Dehydration might occur if there is excessive fluid loss due to diarrhea, which is a symptom of a different kind of malfunction in the gastrointestinal tract.
B. Extreme hunger - This is not typically associated with the function of the large intestine. Extreme hunger is more likely to be related to disorders of the stomach, pancreas, or hormonal imbalances affecting hunger signals.
C. Vomiting - Vomiting is usually a sign of problems in the upper gastrointestinal tract, such as the stomach or small intestine, or it can be a result of central nervous system disorders. It is not a primary symptom of large intestine dysfunction.
Therefore, the most appropriate answer to the question is D. Constipation, as it is the symptom most directly associated with a malfunctioning large intestine.
A chromosome has 13% G. What percentage of
A, C, and T does this DNA molecule have?
Answers
Answer:
a 37%
c 13%
t 37%
Explanation:
c and g go together so a must have the same as g (13%)
a and t go together so they must have equal amounts
100%-13%-13%=how much is left=74%
split this evenly between a and t
74/2=37
Which type of mutation is responsible for small changes in a trait
Answers
Substituion mutation is responsible for small changes in a trait.
Explanation:
This kind of mutation merely changes the type of nucleotide in the DNA sequence. The mutation does not cause a frameshift as would a deletion of addition mutation.
A substitution mutation would at worst change an amino acid in the translated protein. This would likely have a slight effect on how the protein folds into an active protein. On the other hand, mutations that cause frameshifts have the biggest effect on the proteins. They change all the amino acids of a protein downstream of the point of mutation.
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Identify the element that humans need to breathe.
Answers
Answer:
top right
Explanation:
i took it
why do many animals in temperature countries grow thick coats before winter?
Answers
Answer: To help retain warmth throughout the winter, they also grow thicker, shaggier coats, which they shed in the spring when the weather becomes warm again.
Explanation: They want to stay warm.
Hope this helped
:D
At the beginning of 2000 the population of the United States was 282 million people. At the beginning 2010 the population of the United States was 309 million people. Over that time period what was the average change in population per year?
Answers
Answer: A). 2.7 million people per year
Explanation:
From 2000 to 2010 is 10 years. Change in population in 10 years = population at the beginning of 2010 minus the population at the beginning of 2000. This is:
309 million -282 million = 27 million.
Therefore average change in population person year = 27 million/10 = 2.7 million per year
differences between mono di and polysaccharides
Answers
Answer: monosaccharides are simple sugars made up of only a single sugar molecule. Disaccharides are sugars made up of two sugar molecules linked together by a glycosidic bond while polysaccharides are complex sugars made up of many sugar molecules linked together by glycosidic bonds.
Explanation: Examples of monosaccharides are glucose, fructose, and galactose, while examples of disaccharide sugars include maltose, lactose and sucrose. Examples of polysaccharides include glycogen
and starch.
What three parts of the scientific name of a plant do you need to know and understand as an agriscientist? Why?
Answers
Answer:
Scientific name of a plant is represented by the : Name of the Genus, Name of the Species and Name of the sub-species.
Explanation:
Classification of living organisms is done in order to distinguish and separate the contrasting organisms and to club the related organisms near each other. This is done to ease out the study of the diverse living organisms.Genus - It is the hierarchical taxonomic classification of living organisms which is positioned below the Family but above the Species.Species - It is the hierarchical taxonomic classification of living organisms which is positioned below the Genus and above the Sub-species. The individuals belonging to a particular species can interbreed among themselves.Sub-species - It can be defined as the different populations of the same species which may occupy isolated and unrelated habitats and may vary in different characters.Taking the example of pea plant,Name of the Genus - Pisum.Name of the species - sativum.Name of sub-species - sativum (garden pea), elatius (wild pea).Electron microscopes use
____ in order to
allow for higher magnification and more detail when viewing specimens.
Answers
Electron microscopes use _beam of electrons___ in order to allow for higher magnification and more detail when viewing specimens.
Explanation:
A beam of electrons has a shorter wavelength than normal light used in light microscopes, by approximately a factor of X 100000. Therefore, electrons microscope have the inherent attribute of having a very high resolution. They have been used to discover very small organelles in cells such as the ribosomes and mitochondria that cannot be clearly viewed even with the highest resolution in light microscopes.
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Serious brain injury may be caused to an infant by:
Group of answer choices
Not talking to the infant
Lack of visual stimulation
Tossing the infant in the air and catching it
Lack of intellectual stimulation
Answers
Answer:
its is either b or d
Explanation:
B or D
This can cause Shaken Baby Syndrome, which can result in serious brain injury or death.
Hope this helps.
What is skin cancer and how does it occur?
Answers
Answer:
Skin cancer refers to the abnormal activity of skin cells associated with carcinogenesis
Explanation:
This disease is associated with the DNA damage (mutations) often caused by the irrational exposition to UV sun rays that trigger DNA mutations capable of both inactivating tumor suppresor genes and activating oncogenes
Answer:
Skin cancer is the uncontrolled growth of skin cells.
Explanation:
They grow and divide without stopping, and they can spread to other places in your body.
Skin cancer is frequently caused by exposure to ultraviolet rays from the sun or from tanning beds.
The UV light can cause mutations in your skin’s DNA so it can’t control skin cell growth. The result is often skin cancer.
Which of the following composers considered himself outside the bounds of
the patronage system?
O
A. Lully
O
B. Monteverdi
C. Beethoven
O
D. Telemann
SUBMIT
Answers
"Beethoven" composer considered himself outside the bounds of the patronage system.
Answer: Option C
Explanation:
A German composer "Ludwig van Beethoven" excluded himself from patronage system as no heirs stepped forward to maintain the patronage, and even after 1815, Beethoven depended mostly on the auction of compositional assets and a small pension.
Although Beethoven before, received revenue from the publishing of his creations and from live concerts, he also relied on the patronage of income patrons, for whom he gave personal appearances and versions of the works they commissioned for an exclusive period leading up to publication.
Answer:
C
Explanation:
The rate of evaporation depends on four main factors - water body size, heat energy, atmospheric pressure and air movement. Air
movement moving across the top of the water can physically lift water droplets from the surface, increasing evaporation. Based on
this information, you would expect what weather event to cause an ir crease in evaporation over tropical seas?
A)hurricane
B)monsoon
C)tornado
D)tsunami
Answers
Based on this information, you would expect what weather event to cause an ir crease in evaporation over tropical seas hurricane.
What causes hurricane?Causes of Hurricanes. Warm water, wet heat air, and mild upper-stage winds are the important thing components to the formation of hurricanes. Hurricanes start while hundreds of heat, wet air from oceans surfaces begins offevolved to upward thrust quickly, and collide with hundreds of cooler air.
As this climate device movements westward throughout the tropics, heat ocean air rises into the storm, forming a place of low stress underneath. This reasons extra air to hurry in. The air then rises and cools, forming clouds and thunderstorms.
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Why do scientists arrange the organisms on the tree below with some organisms closer than others?
Answers
Answer:
A phylogenetic tree can be described as a diagram which is used to depict the evolutionary histories among organisms and to relate which organisms might have a more common ancestor in the past.
Scientists arrange the organisms on the tree with some organisms closer to one another because these organisms have a more common ancestor in the near past as compared to the other organisms mentioned in the phylogenetic tree.
Answer:
Explanation:
well.... wheres the answer
What does natural resource management aim at?
Natural resource management aims at _________ management of resources.
Answers
Answer:
The correct answer is : Sustainable
Explanation:
Natural resources available on earth are the only source of energy to all living beings.They are of two types, Renewable and Non-renewable.Renewable resources are those that are present in ample amount and can regenerate themselves very quickly and hence do not get exhausted. Eg: Sun, Wind, etc.Non-Renewable resources are those that require a lot of time for their formation and if utilised at a rate which is much higher than its formation rate, can result in its exhaustion. Eg: Fossil fuels, Fresh water from glaciers.Natural Resources need to be utilised economically or in a sustained manner by the present generation to give the nature ample time to regenerate them and to ensure that some resources are retained for the future generations.Answer:
Integrated
Explanation:
Carbonhydrates are an important of ____ compound.
Answers
Answer:
Carbohydrates are the most common type of organic compound
Explanation:
6. Risk assessment depends on
A medicine
B climate
C scientific research
D political stability
Answers
Answer: A
Explanation:
All of the following actions can be taken to positively impact the ocean and earth except:
Answers
Answer:
A. Burning fossil fuels
C. establishing state parks
E. using renewable energy sources
Explanation:
The action that does not have a positive impact is burning fossil fuels, establishing state parks, and using renewable energy sources.
Impact of actions other than ocean & earth:The ocean refers to the continuous body of salt water that covers more than 70 percent of the Earth's surface. The burning of fossil fuels should not be done. The state parks should not be established. Also, the energy sources i.e. renewable should not be used. Due to the above information, it does not have a positive impact.
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