Question

The human male never passes on the gene for haemophilia to his son. Why is it so?

Answer 1

Because haemophilia is a genetic disorder of X linked chromosome.The human male has XY chromosome and female has XX chromosome.So for a son to be formed the X chromosome of the female fuses with the Y chromosome of male.So the disease is not passes on to the son (as the disease is on the X chromosome of male,only the Y fuses).

Answer 2

Answer:

Haemophilia is a sex-linked recessive disease. The defective genes present on the X chromosome only and not on the Y chromosome. As the father always contributes a Y chromosome and never passes an X chromosome to his son, the gene for haemophilia can never be passed from a father to his son.

Explanation:

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