Section 6: Graded Questions Melosis Explored s a homologous chromosome pair with

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Section 6: Graded Questions Melosis Explored s a homologous chromosome pair with two genes, A and B. Each of the two genes has two alleles Q6.9. The image below s (A1 and A2; B1 and B2). For this homologous pair of chromosomes, after completion of meiosis with NO CROSSING OVER, which of the following combinations of alleles might end up in one of the gametes? A1 A1 A2 A2 B2 B1 B1 O A1 and B1 o A2 and B1 . A2 and B2 All of the above are possible Q6.10. For the same homologous pair of chromosomes shown in the previous question, which of the following combinations of alleles might end up in one of the gametes after completion of meiosis WITH CROSSING OVER? . A1 and B2 A2 and B1 A2 and B2 All of the above are possible

Explanation / Answer

Q:6.9 -- Option B.

WITHOUT CROSSING OVER,

After the separation of sister chromatids you would get A1 B2 , A2 B1 in the gametes.

Q:6.10 -- Option D.

WITH CROSSING OVER,

After the separation of sister chromatids you would get all possible combination namely A1 B1 , A1 B2 , A2 B1 , A2 B2 .

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