Why is the father considered decisive in human sex determination?
Answer and explanation
Correct answer: Because sperm can contribute either X or Y chromosome
The governing concept is the XX–XY mechanism of human sex determination. A mother’s egg normally contributes an X chromosome, whereas a father produces sperm carrying either X or Y. Fertilisation with an X-bearing sperm gives XX, while fertilisation with a Y-bearing sperm gives XY. Thus the sperm determines which combination forms. Option A is correct; B, C, and D incorrectly describe the chromosomes contributed by the mother or father.
Frequently asked questions
What is the correct answer to this question?
Because sperm can contribute either X or Y chromosome
Why is this the correct answer?
The governing concept is the XX–XY mechanism of human sex determination. A mother’s egg normally contributes an X chromosome, whereas a father produces sperm carrying either X or Y. Fertilisation with an X-bearing sperm gives XX, while fertilisation with a Y-bearing sperm gives XY. Thus the sperm determines which combination forms. Option A is correct; B, C, and D incorrectly describe the chromosomes contributed by the mother or father.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Heredity and Evolution. Topic: Sex determination.
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