Which of the following gametes can only come from a male parent in humans?

22 + XX

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22 + Y

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22 + XY

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22 + X

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Solution

The correct option is B 22 + Y
The genotype of gametes produced by males are 22+X and 22+Y whereas females produce gametes of only 22+X genotype. This is because the Y chromosome is contained only in males. Hence the 22+Y gamete can come from a male only.

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