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Biology-Related Homework Help Genetics and Developmental Biology Topic started by: veze12345 on Nov 9, 2014



Title: Part B - Nondisjunction Suppose a diploid cell with three pairs of homologous ch
Post by: veze12345 on Nov 9, 2014
Part B - Nondisjunction
Suppose a diploid cell with three pairs of homologous chromosomes (2n = 6) enters meiosis.

How many chromosomes will the resulting gametes have in each of the following cases?
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Title: Re: Part B - Nondisjunction Suppose a diploid cell with three pairs of homologous ch
Post by: bio_man on Nov 9, 2014
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


Title: Re: Part B - Nondisjunction Suppose a diploid cell with three pairs of homologous ch
Post by: doubleu on Nov 9, 2014
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Title: Re: Part B - Nondisjunction Suppose a diploid cell with three pairs of homologous ch
Post by: domingueeliz on Nov 11, 2014
thank you!


Title: Re: Part B - Nondisjunction Suppose a diploid cell with three pairs of homologous ch
Post by: carota on Nov 3, 2015
You are right except for part 5 of the question is 0,3, or 6.