Why is it scientifically wrong to blame the mother for the birth of a girl child?
Answer and explanation
Correct answer: The mother’s egg always contributes X, while the father’s sperm contributes either X or Y
The governing concept is the human XX–XY sex-determination system. Every normal egg contributes an X chromosome. A sperm carrying X produces XX after fertilisation, whereas a sperm carrying Y produces XY. Since the type of sperm is not controlled by the mother, blaming her for a girl child has no scientific basis. Option A correctly describes the chromosome contributions; B and C deny essential parental roles, and D confuses nutrition with inherited chromosomal determination.
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What is the correct answer to this question?
The mother’s egg always contributes X, while the father’s sperm contributes either X or Y
Why is this the correct answer?
The governing concept is the human XX–XY sex-determination system. Every normal egg contributes an X chromosome. A sperm carrying X produces XX after fertilisation, whereas a sperm carrying Y produces XY. Since the type of sperm is not controlled by the mother, blaming her for a girl child has no scientific basis. Option A correctly describes the chromosome contributions; B and C deny essential parental roles, and D confuses nutrition with inherited chromosomal determination.
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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