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Why is the father’s contribution considered decisive for sex determination in humans compared with the mother’s?

Answer and explanation

Correct answer: The mother always contributes X, while the father can contribute either X or Y

In the usual human chromosomal system, the mother is XX, so every ovum carries an X chromosome. The father is XY, so sperm may carry either X or Y. Fertilisation by an X-bearing sperm produces XX, while fertilisation by a Y-bearing sperm produces XY. Therefore option A is correct. The mother contributes a chromosome, and the other options incorrectly deny chromosomal determination or the father’s two sperm types.

Related tags

Sex-DeterminationSex-ChromosomesHuman-ReproductionSex DeterminationHeredity And EvolutionScienceClass 10 Mcq

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