If a haemophilic man marries a woman carrier for haemophilia, then the percentage of progeny that will be haemophilic would be25%50%75%100%
Question
If a haemophilic man marries a woman carrier for haemophilia, then the percentage of progeny that will be haemophilic would be
- 25%
- 50%
- 75%
- 100%
Solution
Haemophilia is a sex-linked recessive disorder. This means that it is carried on the X chromosome.
A haemophilic man would have the genotype XhY (where h represents the haemophilia gene). A woman carrier for haemophilia would have the genotype XHXh (where H represents the normal gene and h represents the haemophilia gene).
Their possible offspring would have the following genotypes:
- XHXh (carrier female)
- XHY (normal male)
- XhXh (haemophilic female)
- XhY (haemophilic male)
So, 50% of their offspring (2 out of 4) would be haemophilic (one male and one female). Therefore, the correct answer is 50%.
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