**Pleiotropy** is best described as:
ATwo genes controlling one trait
BOne gene controlling two or more different traits
CTwo pairs of contrasting alleles
DMultiple alleles at a single locus
Answer & Solution
Correct answer: B. One gene controlling two or more different traits
A pleiotropic gene controls multiple, apparently unrelated traits. Sickle-cell anaemia is a classic example — the Hb^s allele causes anaemia, organ damage, AND confers malaria resistance. Multiple alleles is a distinct concept (different versions of one gene).
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