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During spermatogenesis in human males, what proportion of sperm carries the Y chromosome, and what does this imply for the sex ratio?
AAbout one quarter of sperm carry Y, so the sex ratio favours females overall
BAbout one half of sperm carry Y, giving roughly equal odds of a male or female zygote
CAbout three quarters of sperm carry Y, so the sex ratio favours males overall
DAll sperm carry Y; the egg alone determines the sex of the resulting zygote
Answer & Solution
Correct answer: A. About one quarter of sperm carry Y, so the sex ratio favours females overall
Spermatogenesis produces two kinds of sperm in equal numbers: 50 per cent carry X and 50 per cent carry Y. Since the egg always carries X, fertilisation has roughly equal odds of XX (female) or XY (male) zygotes.
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