Principle of Inheritance and VariationMediumBloom L3
Question
A pleiotropic gene: [NEET 2015 RS]
Options
A.is a gene evolved during Pliocene.
B.controls a trait only in combination with another gene
C.controls multiple traits in an individual.
D.is expressed only in primitive plants
Solution
Sol.(c) [Key Concept: Pleiotropic Gene — Multiple Traits] A PLEIOTROPIC GENE is one that CONTROLS MULTIPLE TRAITS in an individual. A single gene influences several seemingly unrelated phenotypic characteristics simultaneously. Examples: CFTR gene causes cystic fibrosis affecting lungs, pancreas, and reproductive system; PKU gene affects brain development, skin, and hair; Marfan syndrome gene (FBN1) affects skeletal, ocular, and cardiovascular systems. Pleiotropy is very common — most genes have multiple effects.
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