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What are the two distinct divisions of meiosis?

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Quick Answer

The two distinct divisions of meiosis are meiosis I and meiosis II. Meiosis I is responsible for genetic diversity, while meiosis II reduces the amount of DNA in the daughter cells. At the end of meiosis II, each daughter cell has 23 chromosomes.

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Full Answer

Meiosis I and meiosis II both have four stages: prophase, metaphase, anaphase and telophase. During prophase I, DNA condenses and the nuclear envelope disappears, making the chromosomes visible as tetrads. Genetic recombination occurs during prophase I and metaphase I, but it ends as soon as the tetrads pull apart in anaphase I. During telophase I, a nuclear envelope forms around the chromosomes with two chromatids, forming haploid nuclei.

In prophase II, the chromosomes with two chromatids begin to condense, forming a spindle. The chromosomes split during anaphase II, leaving each chromosome with only one chromatid. In telophase II, nuclear envelopes form around the chromosomes with single chromatids. The result of meiosis II is four haploid daughter cells.

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Related Questions

  • Q:

    Why is crossing over important in meiosis?

    A:

    Crossing over in meiosis results in genetic recombination, which is responsible for the genetic diversity of a population. Genetic recombination and natural selection are the driving forces behind evolution. It causes most of the differences between parents and their offspring and differences between siblings.

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  • Q:

    What is the purpose of meiosis?

    A:

    Meiosis is the process of cell division that creates offspring in sexually reproducing organisms, explains a University of Illinois at Chicago website. Unlike during mitosis, meiotic cell division starts with double the number of chromosomes in diploid parent cells. Meiosis cuts this number in half forming two haploid daughter cells. When these daughter cells combine and undergo fertilization, a zygote is created and the cell begins to develop.

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  • Q:

    How do I describe meiosis?

    A:

    Meiosis is the process in which cells divide to produce sex cells. Meiosis takes a single cell and divides it into four different cells with half of the necessary chromosomes for human development. Meiosis creates both egg and sperm cells.

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  • Q:

    What is the difference between meiosis 1 and meiosis 2?

    A:

    The essential difference between meiosis I and meiosis II is in purpose. Meiosis I is dedicated to forming two haploid cells from one diploid cell, while meiosis II is meant to split the sister chromatids in the haploid cells produced in meiosis I, creating four daughter cells. Meiosis I also recombines, or shuffles, genes on each pair of chromosomes. Meiosis I and meiosis II happen in succession.

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