KROK 1 2008 – Question 191 · KROK (Medicine) · Biology
As a result of prophylactic medical examination a 7 year old boy was diagnosed with Lesch-Nyhan syndrome (only boys fall ill with it). The boy’s parents are healthy but his grandfather by his mother’s side suffers from the same disease. What type of disease inheritance is it?
- A. Autosomal dominant
- B. Recessive, sex-linked
- C. Dominant, sex-linked
- D. Semidominance
- E. Autosomal recessive
Hint
Only boys are affected, both parents are healthy and the disease came down from the mother's father; think which chromosome carries the gene and how carriers behave.
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