Question

Sol.(c) [Key Concept: Pleiotropy — One Gene Multiple Effects] PLEIOTROPY is when a SINGLE GENE expresses more than one phenotypic effect. A pleiotropic gene influences multiple seemingly unrelated traits simultaneously. Example: the white eye gene in Drosophila also affects sperm storage organs and body morphology; PKU gene affects brain development, hair colour, and skin pigmentation. Multiple allelism = multiple alleles at one locus; mosaicism = cells with different genotypes; polygeny = multiple genes controlling one trait.