Why is the father’s role considered decisive in sex determination of a human child?
Answer and explanation
Correct answer: The father’s sperm can carry either an X or a Y chromosome
The governing concept is the XX–XY system of human sex determination. A mother’s egg normally contributes an X chromosome, whereas the father produces two kinds of sperm: X-bearing and Y-bearing. X sperm plus X egg gives XX, while Y sperm plus X egg gives XY. Thus the sperm determines which sex-chromosome combination forms, making option A correct. The mother contributes an essential chromosome too, so the distractors incorrectly deny her role or the existence of chromosomes.
Frequently asked questions
What is the correct answer to this question?
The father’s sperm can carry either an X or a Y chromosome
Why is this the correct answer?
The governing concept is the XX–XY system of human sex determination. A mother’s egg normally contributes an X chromosome, whereas the father produces two kinds of sperm: X-bearing and Y-bearing. X sperm plus X egg gives XX, while Y sperm plus X egg gives XY. Thus the sperm determines which sex-chromosome combination forms, making option A correct. The mother contributes an essential chromosome too, so the distractors incorrectly deny her role or the existence of chromosomes.
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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