A carrier of haemophilia is typically
- A. a man suffering from the disease
- B. a heterozygous woman with one normal and one haemophilia allele
- C. a homozygous normal woman
- D. a person with an extra chromosome
Explanation
A carrier holds the recessive allele without symptoms because the normal allele on her other X is enough for clotting. A man with the allele is affected rather than a carrier, since he has no second X.
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