KROK 1 2009 – Question 68 · KROK (Medicine) · Biology
During a prophylactic medical examination a 7-year-old boy was diagnosed with daltonism. His parents are healthy and have normal colour vision, but his grandfather on his mother’s side has the same abnormality. What is the type of the abnormality inheritance?
- A. Autosomal dominant
- B. Dominant, sex-linked
- C. Semidominance
- D. Autosomal recessive
- E. Recessive, sex-linked
Hint
Follow the trait from the maternal grandfather through a healthy mother to her son, and ask which chromosome must carry the gene for it to be passed on in this way.
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