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If a Y chromosome comes from the father and an X chromosome comes from the mother, what will the offspring be?

Answer and explanation

Correct answer: Boy

The mother’s egg contributes an X chromosome, while the father’s sperm may contribute either X or Y. In this case the combination is X + Y = XY. Under the usual human XX–XY system, an XY zygote generally develops as a male, so option A is correct. An XX combination is usually female, and the alternatives neither represent the chromosome result nor a biological outcome of this fertilisation.

Related tags

Sex DeterminationXyBoy ChildHeredity And EvolutionWorld Of LivingScienceClass 10 Mcq

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