The phenomenon of pleiotropism refers to:

Options

1. A single gene affecting multiple phenotypic expressions
2. More than two genes affecting a single character
3. Presence of several alleles of a single gene controlling a single crossover
4. Presence of two alleles, each of two genes controlling a single trait

Correct Answer

A single gene affecting multiple phenotypic expressions

Explanation

Pleiotropy occurs when a single gene influences multiple traits — e.g., the gene for sickle-cell anemia affects both hemoglobin shape and oxygen transport.

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