KROK 1 2017 – Question 137 · KROK (Medicine) · Biology
Cystinuria manifests itself in a human as cystine stones in the kidneys (homozygous individuals) or increased cystine content in the urine (heterozygous individuals). Cystinuria is a monogenic disorder. Determine the type of interaction between the genes of cystinuria and normal urine cystine excretion:
- A. Codominance
- B. Semidominance
- C. Epistasis
- D. Complete dominance
- E. Complementarity
Hint
Compare the phenotype of the heterozygote with those of both homozygotes and ask whether it matches either one or lies in between.
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