Blaming the mother for the birth of a girl child goes against which scientific fact?
Answer and explanation
Correct answer: The mother contributes X, while the father’s X- or Y-bearing sperm determines the sex-chromosome combination
The usual human XX-XY mechanism shows why blaming the mother is scientifically unjustified. Every normal ovum contributes an X chromosome. A sperm contributes either X or Y; XX generally develops as female and XY generally as male. Thus the father’s sperm determines which sex-chromosome combination forms, although fertilisation is a contribution from both parents. Option A is correct; B, C and D contradict this mechanism.
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What is the correct answer to this question?
The mother contributes X, while the father’s X- or Y-bearing sperm determines the sex-chromosome combination
Why is this the correct answer?
The usual human XX-XY mechanism shows why blaming the mother is scientifically unjustified. Every normal ovum contributes an X chromosome. A sperm contributes either X or Y; XX generally develops as female and XY generally as male. Thus the father’s sperm determines which sex-chromosome combination forms, although fertilisation is a contribution from both parents. Option A is correct; B, C and D contradict this mechanism.
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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