If an X chromosome comes from the father and an X chromosome comes from the mother, what will the offspring be?
Answer and explanation
Correct answer: Girl
The mother’s egg normally contributes an X chromosome. If the father’s sperm also contributes an X chromosome, the zygote receives X + X, giving the chromosomal combination XX. In the standard human XX–XY system, XX generally develops as a female, so option A is correct. An XY combination is usually male; the other choices do not follow from the stated chromosome combination.
Frequently asked questions
What is the correct answer to this question?
Girl
Why is this the correct answer?
The mother’s egg normally contributes an X chromosome. If the father’s sperm also contributes an X chromosome, the zygote receives X + X, giving the chromosomal combination XX. In the standard human XX–XY system, XX generally develops as a female, so option A is correct. An XY combination is usually male; the other choices do not follow from the stated chromosome combination.
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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