4. What are three ways that generate genetic variability during the process of meiosis? Why don’t...

4. What are three ways that generate genetic variability during the process of meiosis?

Why don’t these occur during mitosis?

Expert Solution

The processes which give rise to variations between meiosis are -

1. The first is the process of crossing over which occurs during prophase 1 of meiosis 1. It is the exchange of genetic material between non sister chromatids of homologous chromosomes. One pair of homologous chromosomes contains one paternal and one maternal chromosome. After the process of crossing over, recombinant chromosomes are formed which are not only different from each other but also from the parent chromosome. They are a mix of both paternal and maternal chromosomes.

2. The second process is the independent assortment of chromosomes one from one another during metaphase 1 of meiosis 1. It is the segregation of alleles of different genes from each other so that every gamete receives one allele of a gene.

3. The third process is the segregation of chromosomes from one another. In this process, alleles of same gene segregate independently of each other during the gamete formation. It takes place in anaphase 1 of meiosis 1.

All these three events and sure that every gamete receives one allele of every genes and also all the gametes are different from one another and also from the parent cell.

These events do not take place in mitosis because mitosis is primarily responsible for the maintenance of the body of an individual. It does not participate in the formation of gametes. Whenever the maintenance of the body of an individual is required, then no variations are required in this process. But if the gametes are to be formed, then it should be ensured that there is a great variation within the gametes and also between the gametes and the parent cell because the most important feature of sexual reproduction is variation which can occur only during the formation of gametes with the help of meiosis.

Please give a good rating.

gladiator answered 2 years ago

Describe at least 3 different ways that meiosis and sexual reproduction increases genetic variability in offspring.

Describe at least 3 different ways that meiosis and sexual reproduction increases genetic variability in offspring. What advantage does that give sexually reproducing organisms over asexually reproducing organisms? When is asexual reproduction an advantage over sexual reproduction?

Identify THREE ways that sexual reproduction increases genetic variability. For each, explain how it increases genetic...

Identify THREE ways that sexual reproduction increases genetic variability. For each, explain how it increases genetic diversity among the offspring.

Describe the mechanisms by which meiosis would introduce genetic variability in a population. If one diploid...

Describe the mechanisms by which meiosis would introduce genetic variability in a population. If one diploid yeast cell was heterozygous for an allele with a Dominant mutation on it, what proportion of its offspring could be expected to carry that dominant mutation after mating? (Assume it mates with a cell that is homozygous for the normal, recessive allele.) Interestingly, yeast switch to sexual reproduction when they are under conditions of stress. For the purposes of this task, assume yeast populations...

Provide two reasons why the process of meiosis leads to genetic variation in diploid organisms.

What are two ways that the mechanisms of meiosis introduce genetic variation into the processes of sexual reproduction?

Briefly explain the three factors that contribute to genetic variability.

Briefly explain the three factors that contribute to genetic variability. Independent assortment Crossover of homologues Random fertilization Briefly describe the following. Provide an example for each. Dominant-recessive inheritance Incomplete dominance inheritance Multiple-allele inheritance Sex-linked inheritance Polygene inheritance Extranuclear (mitochondrial) inheritance (not really a pattern What role, if any, do environmental factors play in gene expression? What is genetic screening? Why do they determine pedigrees? What do we mean by the following terms: Homozygous trait Heterozygous trait Dominant gene Recessive...

Compare and contrasts meiosis and mitosis. How do the behavior of chromosomes during meiosis generate variation and...

Compare and contrasts meiosis and mitosis. How do the behavior of chromosomes during meiosis generate variation and explain Mendel’s law of independent assortment? Long answer, please.

1. Evolutionary process and genetic variation: a) Explain to the general public how genetic variability occurs...

1. Evolutionary process and genetic variation: a) Explain to the general public how genetic variability occurs in domesticated organisms, and why mutation is an essential component that allows for production of new agricultural varieties. b) Explain the following statement to a college science freshman: “The genetic variation on which natural selection acts may occur randomly, but natural selection is not random at all.” c) Describe two situations where mutations are random, and two situations where the mutations are not random. ...

1) During meiosis, an oocyte divides twice and generate 4 haploid cells. Cohesin proteins hold homologous...

1) During meiosis, an oocyte divides twice and generate 4 haploid cells. Cohesin proteins hold homologous chromosomes AND chromatids together. Experimental evidence shows these are loaded onto the chromosomes in S phase. Cohesin at the centromeres are released by securins during anaphase. SOme cohesin components such as SMC1 are down-regulated in older oocytes. If this is the case, at what stage(s) would you expect to see mis-segregating DNA? a. Meiosos I b. both meiosis I and II c. none of...

Briefly describe three main mechanisms that produces genetic variability in the F1

Question