Why does the sex of a human child depend on the chromosome coming from the father?
Answer and explanation
Correct answer: Because either X or Y can come from the father
In the usual human chromosomal pattern, a mother has XX sex chromosomes and her egg contributes an X chromosome. A father has XY chromosomes and his sperm may carry either X or Y. Fertilisation by an X-bearing sperm produces XX, while fertilisation by a Y-bearing sperm produces XY. Thus the sex chromosome contributed by the father determines the chromosomal combination. This does not mean that either parent is responsible in a moral sense; it describes random biological inheritance. Option A is correct.
Frequently asked questions
What is the correct answer to this question?
Because either X or Y can come from the father
Why is this the correct answer?
In the usual human chromosomal pattern, a mother has XX sex chromosomes and her egg contributes an X chromosome. A father has XY chromosomes and his sperm may carry either X or Y. Fertilisation by an X-bearing sperm produces XX, while fertilisation by a Y-bearing sperm produces XY. Thus the sex chromosome contributed by the father determines the chromosomal combination. This does not mean that either parent is responsible in a moral sense; it describes random biological inheritance. Option 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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