A human child is typically female with which sex-chromosome combination?
Answer and explanation
Correct answer: XX
The governing concept is the normal XX–XY pattern in humans. The mother contributes an X chromosome through the ovum. If the father contributes an X-bearing sperm, the fertilised egg receives X from each parent, giving the combination XX, which is typically female. An XY combination is typically male, YY is not a normal viable human combination, and a single Y alone cannot represent the usual diploid condition. Therefore A is correct.
Frequently asked questions
What is the correct answer to this question?
XX
Why is this the correct answer?
The governing concept is the normal XX–XY pattern in humans. The mother contributes an X chromosome through the ovum. If the father contributes an X-bearing sperm, the fertilised egg receives X from each parent, giving the combination XX, which is typically female. An XY combination is typically male, YY is not a normal viable human combination, and a single Y alone cannot represent the usual diploid condition. Therefore A is correct.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Heredity and Evolution.
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