A human child is typically male when which chromosome is received from the father?
Answer and explanation
Correct answer: Y chromosome from the father
The governing concept is the XX–XY mechanism of human sex determination. The mother’s ovum contributes X, whereas the father’s sperm may contribute X or Y. If a Y-bearing sperm fertilises the ovum, the zygote has XY chromosomes and is typically male; an X-bearing sperm produces XX, typically female. The mother does not normally supply Y, and sex chromosomes are always present. Thus A is correct.
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What is the correct answer to this question?
Y chromosome from the father
Why is this the correct answer?
The governing concept is the XX–XY mechanism of human sex determination. The mother’s ovum contributes X, whereas the father’s sperm may contribute X or Y. If a Y-bearing sperm fertilises the ovum, the zygote has XY chromosomes and is typically male; an X-bearing sperm produces XX, typically female. The mother does not normally supply Y, and sex chromosomes are always present. Thus 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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