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

Answer and explanation

Correct answer: XX

The governing concept is chromosomal sex determination in humans. The egg contributes one X chromosome, and the stated sperm also contributes one X chromosome. Adding the two contributions gives X + X = XX. In the standard school-level XX–XY system, XX is the usual female chromosomal combination. XY would require a Y-bearing sperm, YY cannot result because the egg supplies X, and OO is not a human sex-chromosome combination. Therefore A is correct.

Related tags

Xx-ChromosomeSex-DeterminationHuman-ChromosomesSex DeterminationHeredity And EvolutionScienceClass 10 Mcq

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