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6 May, 18:23

How many chromosomes will the resulting gametes have in each of the following cases? drag one label into each space at the right of the table. labels can be used once, more than once, or not at all.?

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  1. 6 May, 18:42
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    Below are the cases:

    Number of Chromosomes: 3 only; 0 or 3; 0 or 6; 2 or 4; 0, 3, or 6; 2, 3, 4

    Situations:

    1.) Meiosis occurs normally (no nondisjunctions)

    2.) Nondisjunction of one chromosome pair in meiosis I

    3.) Nondisjunction of all three chromosome pairs in meiosis

    4.) Nondisjunction in one chromosome of one daughter cell in meiosis II

    5.) Nondisjunction of all three chromosomes of one daughter cell in meiosis II

    Below is the answer:

    Just draw out daughter cells in Meiosis I and II if you get confused.

    1. Regular meiosis is 2n - - > n, so each daughter cells has 3 chromsomes

    2. After Meiosis I, 1 daughter cell will have 4 chromosomes, and the other 2. If disjunction occurs normally in Meiosis II, end result is 2 daughter cells with 4 chromsomes, and 2 daughter cells with 2 chromosomes. (4,4,2,2)

    3. After Meiosis I, 1 daughter cell has 6 chromosomes, and the other 0. After Meiosis II, 2 daughter cells with 6, and 2 daugther cells with 0. (6,6,0,0).

    4. After Meiosis I, both daughter cells has 3 chromsomes. After Meiosis II, 2 daughter cells will have 3 chromosomes, and 1 daugter cell will have 4, and 1 daughter cell will have 2. (3,3,4,2)

    5. After Meiosis I, both daughter cells has 3 chromosomes. Non-disjuction occurs in both daughter cells in Meiosis II, so it would be 3,0,3,0
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