What is the scientific basis for saying that the father's contribution is decisive in sex determination?
Answer and explanation
Correct answer: A sperm can contribute one of two types of sex chromosomes
In the usual human XX–XY system, the mother’s egg contributes an X chromosome in every fertilisation. The father produces two broad sperm types: X-bearing and Y-bearing. Fusion of an X sperm with the egg usually gives XX, while fusion of a Y sperm usually gives XY. Therefore the sperm contribution determines the chromosomal sex; this does not mean that either parent morally controls the outcome.
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What is the correct answer to this question?
A sperm can contribute one of two types of sex chromosomes
Why is this the correct answer?
In the usual human XX–XY system, the mother’s egg contributes an X chromosome in every fertilisation. The father produces two broad sperm types: X-bearing and Y-bearing. Fusion of an X sperm with the egg usually gives XX, while fusion of a Y sperm usually gives XY. Therefore the sperm contribution determines the chromosomal sex; this does not mean that either parent morally controls the outcome.
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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