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Sequence No.

BIO-338

A haemophilic father can never pass the gene for haemophilia to his son. Explain.

Answer:

Haemophilia is a X-linked recessive disease. It is transmitted from the carrier female to her son. The disease is being transmitted from the carrier mother to her daughter (carrier) and son (affected). The carrier daughter transmits this disease to the grandson. This pattern of inheritance is known as criss-cross inheritance.

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BIO-338

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