Question

explain why father never passes on a haemophilia gene to his son? even with this condition haemophilia victims are mostly men while women are rarely affected. give reasons

Answer 1

The haemophilia is a defect that has been found to occur due to a recessive mutation of a gene locatex on the X chromosome of a man.Thus it is a X linked recesive genetic defect in man.
Because of the sex linkage females are carrior of the disease and males are affected.

This is because when a gene containing a revessive haemophilia is present in a male it gets expressed since a male has only one X chromosome.
But in case of a female there is another X chromosome that can suppress the haemophilic gene. This is why females are not generally affected but become carriers of haemophilia.

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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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