The phenomenon of pleiotropism refers to:
- Apresence of several alleles of a single gene controlling a single crossover.
- Bpresence of two alleles, each of the two genes controlling a single trait.
- Ca single gene affecting multiple phenotypic expression.
- Dmore than two genes affecting a single character.
Solution & Step-by-step Explanation
Pleiotropy is the condition where a single gene influences multiple, seemingly unrelated phenotypic traits. A classic example is Phenylketonuria (PKU), where one gene mutation causes mental retardation, reduced hair, and skin pigmentation.