In mammals, there are two sex chromosomes, X and Y, which behave like homologous
ID: 69583 • Letter: I
Question
In mammals, there are two sex chromosomes, X and Y, which behave like homologous chromosomes during meiosis. Normal males have one X chromosome and one Y chromosome, and normal females have two X chromosomes. Males with an extra Y chromosome (XYY) are found occasionally. Which of the following could give rise to such an XYY male?
A. nondisjunction in the first meiotic division of oogenesis; normal meiosis in the father B. nondisjunction in the first meiotic division of spermatogenesis; normal meiosis in the mother C. nondisjunction in the second meiotic division of oogenesis; normal meiosis in the father D. nondisjunction in the second meiotic division of spermatogenesis; normal meiosis in the motherExplanation / Answer
D. nondisjunction in the second meiotic division of spermatogenesis; normal meiosis in the mother
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