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Standard XII
Biology
What is Pleiotropy?
Question

A pleiotropic gene
  1. Controls multiple traits in an individual
  2. Is a gene evolved during Pliocene
  3. Controls a trait only in combination with another gene
  4. Is expressed only in primitive plants

A
Controls multiple traits in an individual
B
Controls a trait only in combination with another gene
C
Is a gene evolved during Pliocene
D
Is expressed only in primitive plants
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Solution
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Pleiotropy refers to the phenomenon in which a single gene controls several distinct, and seemingly unrelated, phenotypic effects. A classic example of pleiotropy is the human disease PKU (phenylketonuria). This disease can cause mental retardation and reduced hair and skin pigmentation, and can be caused by any of a large number of mutations in a single gene that codes for an enzyme (phenylalanine hydroxylase) that converts the amino acid phenylalanine to tyrosine, another amino acid.
So, the correct answer is option A.

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