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If both the egg and the sperm contribute X chromosomes, what will be the sex-chromosome combination of the child?

Answer and explanation

Correct answer: Female child

The mother’s egg contributes one X chromosome, and in this case the father’s sperm also contributes X. Their union produces the combination XX: X + X = XX. In the standard human chromosomal model, XX corresponds to a female child, so option A is correct. A Y chromosome is absent in this combination, so it cannot be YY or XY, and fertilisation can still produce a zygote.

Related tags

Sex DeterminationXxFemale ChildHeredity And EvolutionScienceClass 10 Mcq

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