You asked: Which two stages of meiosis are most responsible for genetic variation?

When you ask, “How does meiosis create genetic diversity in a species?” what you are really asking, at a more basic level is, “Which phases of meiosis are responsible for producing the genetic variation seen in gametes?” For now, just know that these phases are two in number and are labeled prophase 1 and metaphase 2.

Which phase of meiosis is responsible for genetic variation?

During prophase of meiosis I, the double-chromatid homologous pairs of chromosomes cross over with each other and often exchange chromosome segments. This recombination creates genetic diversity by allowing genes from each parent to intermix, resulting in chromosomes with a different genetic complement.

Which two stages are most responsible for the genetic variation?

The two factors are: crossing-over and independent assortment. Crossing over: In Prophase I of Meiosis I, homologous chromosomes line up their chromatids and “cross-over”, or exchange corresponding segments of DNA with each other. This produces genetic variation by allowing more combinations of genes to be produced.

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What two processes produce genetic variation in meiosis?

There are two ways meiosis causes genetic diversity: recombination in prophase (meiosis I) reducing the number of chromosomes to half.

Which stage of cell division is mainly responsible for genetic variability?

By contrast, the process of meiosis, which only occurs in germinal cells, produces non-identical haploid daughter cells. Meiosis ensures genetic variability by ‘shuffling’ our ‘deck of genes’.

What 2 steps of meiosis are most important creating genetic variation and how is variation generated in each of these steps?

The process that produces gametes is called meiosis.

The phases of meiosis in humans.

Interphase Replication of DNA in preparation for meiosis. After replication, each chromosome becomes a structure comprising 2 identical chromatids.
Metaphase I Paired chromosomes line up along the middle of the cell.

What is the main difference between metaphase I and metaphase II?

Metaphase 1 is associated with meiosis 1 whereas the metaphase 2 is associated with meiosis 2. The main difference between metaphase 1 and 2 is that chromosomes are attached as homologous pairs at the equator during the metaphase 1 and during metaphase 2, single chromosomes are attached at the equator.

Which of the following is responsible for variation in DNA?

Mutations, the changes in the sequences of genes in DNA, are one source of genetic variation. Another source is gene flow, or the movement of genes between different groups of organisms. Finally, genetic variation can be a result of sexual reproduction, which leads to the creation of new combinations of genes.

What occurs in both meiosis and mitosis?

Which of the following occur in both mitosis and meiosis? Explanation: The separation of sister chromatids is the only item of the answer choices that occurs in both mitosis and meiosis. Prophase II and metaphase II only occur in meiosis, as does recombination between homologous chromosomes.

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How are the processes of meiosis I and meiosis II different?

In meiosis I, homologous chromosomes separate, while in meiosis II, sister chromatids separate. Meiosis II produces 4 haploid daughter cells, whereas meiosis I produces 2 diploid daughter cells. Genetic recombination (crossing over) only occurs in meiosis I.

How does meiosis contribute to genetic variation quizlet?

During prophase of meiosis I, the double-chromatid homologous pairs of chromosomes cross over with each other and often exchange chromosome segments. This recombination creates genetic diversity by allowing genes from each parent to intermix, resulting in chromosomes with a different genetic complement.

Which processes increase variation during meiosis quizlet?

The two factors are: crossing-over and independent assortment. Crossing over: In Prophase I of Meiosis I, homologous chromosomes line up their chromatids and “cross-over”, or exchange corresponding segments of DNA with each other. This produces genetic variation by allowing more combinations of genes to be produced.

Does meiosis contribute to genetic variation?

Meiosis is important because it ensures that all organisms produced via sexual reproduction contain the correct number of chromosomes. Meiosis also produces genetic variation by way of the process of recombination.

Why is meiosis II needed?

The two chromosomes are not seperated during Meiosis I. The cells are diploid, therefore in order to distribute the chromosomes eqully among the daughter cells so that they contain half the chromosome , Meiosis II is necessary. … Chromosome number remains the same in the daughter cells.

How does meiosis contribute to genetic recombination?

When recombination occurs during meiosis, the cell’s homologous chromosomes line up extremely close to one another. Then, the DNA strand within each chromosome breaks in the exact same location, leaving two free ends. Each end then crosses over into the other chromosome and forms a connection called a chiasma.

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