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Question Question 3(i)
Haemophilia is a genetic disorder in which the sufferers are at risk of bleeding to death. What are the chances of a girl child to be haemophilic if her mother is normal and father is haemophilic?
When the mother is normal and father is haemophilic, the chances of the girl child to be haemophilic is extremely low. Haemophilia is an X-linked recessive genetic disorder caused by mutations in genes located on the X chromosome. Since, the girl inherits two X chromosomes, one from father and one from mother, the chance of both X chromosomes carrying the recessive mutation is indeed rare.