NEET Biology question

Gamete mother cells of the chromosome 44+XY suffers from non-disjunction at first meiotic division. Which of the following set of gametes would result?

(A)22+XX, 22+XY, and 22, 22
(B)22+XY, 22+XY, and 22, 22Correct
(C)22+X, 22+Y, and 22+Y, 22
(D)22+X, 22+XY, and 22+Y, 22+Y

Answer: (B)

Solution

Non-disjunction at the first meiotic division means the X and Y chromosomes fail to separate, so one secondary spermatocyte receives both X and Y (22+XY) while the other receives neither (22, with no sex chromosome); normal second meiotic division then simply splits

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Question ID VK-120099