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Which chromosome combination is responsible for the birth of a girl in humans?

Answer and explanation

Correct answer: XX

In the usual human chromosomal system, females have two X sex chromosomes, written as XX, while males generally have one X and one Y, written as XY. An egg contributes an X chromosome, and an X-bearing sperm contributes the second X, producing an XX zygote. Therefore A is correct. YY is not a normal viable human combination, and XO represents a different chromosomal condition rather than the usual pattern.

Related tags

Xx ChromosomeSex DeterminationHuman GeneticsHeredity And EvolutionScienceClass 10 Mcq

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