KROK 1 2012 – Question 80 · 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 recessive
- B. Autosomal dominant
- C. Dominant, sex-linked
- D. Recessive, sex-linked
- E. Semidominance
Hint
Follow the trait from the grandfather through the healthy parent to the boy, and ask which chromosome carries the gene and whether it is expressed in a carrier.
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