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What combination will form when a Y-chromosome sperm fuses with an X-chromosome egg?

Answer and explanation

Correct answer: XY

The governing concept is the XX–XY mechanism of human sex determination. The egg contributes X, while the sperm specified in the question contributes Y. Their union therefore gives X + Y = XY. In the standard school classification, XY is the usual male chromosomal combination. XX would result from an X-bearing sperm, YY cannot form because the egg does not carry Y, and XO represents a different chromosomal condition rather than the stated fusion. Hence option B is correct.

Related tags

Xy-ChromosomeSex-DeterminationHuman-ReproductionSex DeterminationHeredity And EvolutionScienceClass 10 Mcq

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