A) controls a trait only in combination with another gene
B) controls multiple traits in an individual
C) is expressed only in primitive plants
D) is a gene evolved during Pliocene
Correct Answer: B
Solution :
[b] The ability of a gene to have multiple phenotypic effects because it influences a number of characters simultaneously is known as pleiotropy. The gene having a multiple phenotypic effect because of its ability to control expression of two or more characters is called pleiotropic gene. In human beings, pleiotropy is exhibited by syndromes like sickle-cell anaemia and phenylketonuria.
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