KROK 1 2008 – Question 184 · KROK (Medicine) · Biology
Hartnup disease is caused by point mutation of only one gene which results in disturbance of tryptophane absorption in the bowels and its resorption in the renal tubules. It is the reason for disorder of both digestive and urination systems. What genetic phenomenon is observed in this case?
- A. Pleiotropy
- B. Polymery
- C. Complementary interaction
- D. Codominance
- E. Semidominance
Hint
The stem says only one gene is mutated, yet the gut and the kidney are both affected; compare terms that describe how many genes act on one trait with terms that describe how the two alleles of one gene interact.
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