Wednesday, February 3, 2010

2. MEIOSIS


Click here for a meiosis tutorial. Once you read about meiosis, you can scroll down and watch the animation on meiosis I and II.

How is meiosis different to mitosis?
What is the importance of crossing over?
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2 comments:

  1. NinaFebruary 4, 2010 at 9:31 PM

    Answers to questions:

    1. Differences between mitosis and meisosis:
    Meiosis
    - 4 daughter cells
    - Daughter cells have half the number chromosomes as the parent (haploid)
    - Parent cell is a gamete producing cell (ovary or testes)
    - Homologous chromosomes pair up (during Prophase I)
    Mitosis
    - 2 daughter cells
    - Daughter cells are identical to parent cells (diploids - 46 chromosomes)
    - Parent cell is a somatic cell (body cell)
    2. The importance of crossing over is it introduces varation and is what makes us all different.

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  2. AnonymousFebruary 7, 2010 at 1:35 PM

    there are many differences between meiosis and mitosis:
    -mitosis occurs in body cells/meiosis occurs in sex cells

    -mitosis results in 2 daughter cells/meiosis results in 4 daughter cells

    -daughter cells of mitosi are diploids/daughter cells of meiosis are haploids

    -crossing over is important because the embryo can be a mix of both parents

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