KROK 1 2012 – Question 4 · KROK (Medicine) · Biology
A couple has a son with haemophilia. The parents are healthy but the maternal grandfather also has haemophilia. Specify the type of inheritance:
- A. Dominant sex-linked
- B. Autosomal dominant
- C. Semidominance
- D. Recessive autosomal
- E. Recessive sex-linked
Hint
Trace the trait from the grandfather to the grandson and ask through which parent the allele travelled, and why healthy parents can still have an affected boy.
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