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Why is the father's role considered clearer in determining the sex of a human child?

Answer and explanation

Correct answer: Because a father’s sperm can carry either an X or a Y chromosome

In the usual human XX–XY system, every egg produced by the mother carries an X chromosome. A father produces two types of sperm: some carry X and some carry Y. Fertilisation by an X-bearing sperm gives XX, while fertilisation by a Y-bearing sperm gives XY. Thus the sperm determines whether the zygote is XX or XY, making option A correct. This does not mean that the father controls the outcome consciously.

Related tags

Sex DeterminationX ChromosomeY ChromosomeHeredity And EvolutionScienceClass 10 Mcq

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