If a Y chromosome comes from the father and an X chromosome comes from the mother, what will the offspring be?
Answer and explanation
Correct answer: Boy
The mother’s egg contributes an X chromosome, while the father’s sperm may contribute either X or Y. In this case the combination is X + Y = XY. Under the usual human XX–XY system, an XY zygote generally develops as a male, so option A is correct. An XX combination is usually female, and the alternatives neither represent the chromosome result nor a biological outcome of this fertilisation.
Frequently asked questions
What is the correct answer to this question?
Boy
Why is this the correct answer?
The mother’s egg contributes an X chromosome, while the father’s sperm may contribute either X or Y. In this case the combination is X + Y = XY. Under the usual human XX–XY system, an XY zygote generally develops as a male, so option A is correct. An XX combination is usually female, and the alternatives neither represent the chromosome result nor a biological outcome of this fertilisation.
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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