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a
the mother must be haemophilic
b
the father must be haemophilic
c
the mother may be haemophilic or carrier for haemophilia.
d
the father may be haemophilic or carrier for haemophilia.
answer is C.
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Detailed Solution
The son inherits X-chromosome from the mother. So, a haemophilic or a carrier mother can pass the X-chromosome with the defective gene to son resulting in haemophilia.