Why is the sex of a human child considered to be influenced more by the father?
Answer and explanation
Correct answer: Because the father's sperm can give either an X or a Y chromosome.
In the usual human XX–XY system, the mother’s egg carries an X chromosome, whereas a father produces two types of sperm: X-bearing and Y-bearing. Fertilisation by an X sperm generally produces XX, while fertilisation by a Y sperm generally produces XY. Thus the paternal sperm determines whether the zygote receives X or Y from the father. Option B is correct; the other statements misrepresent the chromosomes in eggs or sperm.
Frequently asked questions
What is the correct answer to this question?
Because the father's sperm can give either an X or a Y chromosome.
Why is this the correct answer?
In the usual human XX–XY system, the mother’s egg carries an X chromosome, whereas a father produces two types of sperm: X-bearing and Y-bearing. Fertilisation by an X sperm generally produces XX, while fertilisation by a Y sperm generally produces XY. Thus the paternal sperm determines whether the zygote receives X or Y from the father. Option B is correct; the other statements misrepresent the chromosomes in eggs or sperm.
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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