NEET 2001 Biology question

Male XX and female XY sometime occur due to

(1)Deletion
(2)Transfer of segments in X and Y chromosomesCorrect
(3)Aneuploidy
(4)Hormonal imbalance

Answer: (2)

Solution

The male-determining gene (SRY, testis-determining factor) lies on the Y chromosome. If during male meiosis a segment of the Y containing this gene is transferred (translocated, by abnormal crossing over between the pairing segments of X and Y) to the X chromosome, a sperm

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Question ID VK-088896