KROK 1 2020 – Question 106 · KROK (Medicine) · Biology
Genealogical analysis of a child with myotonic dystrophy determined that this disease manifests in every generation, is in equal measure present in the relatives of both genders, the risk of inheriting this disease is equal no matter which parent is affected. If one of the parents is heterozygous for this disease and the other parent is healthy, the risk of them giving birth to a sick child is 50%. What type of disease inheritance is it?
- A. Y-linked
- B. Autosomal dominant
- C. X-linked dominant
- D. Autosomal recessive
- E. X-linked recessive
Hint
Use each pedigree clue in the stem (affected generations, sex ratio, transmission from either parent, 50% risk) to rule patterns of inheritance in or out one by one.
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