Question

why does haemophilia occur more in male

Answer 1

Haemophilia occurs more in male because it is an x-linked inheritance disease. Haemophilia is a recessive factor. Males have one x and one y chromosome so if x chromosome is defected then the effect cannot be masked. In females there are two x chromosomes so if one x chromosome is defected then the other x chromosome (normal one) would mask the defect.

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Answer 2

Haemophilia is a sex linked (x-linked) recessive disorder

The heterozygous female ,unaffected carrier for heamophilia may transmit the disease to son (50%)
A man can inherit this disease frm heterozygous carrier mother

A female became heamophilic only when a father is heamophilic and mother is heterozygous carrier ,and it is extreamly rare ( unviable in the later stage of life)

Thats why it occur rarely in females