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NEETZoologyPrinciples of Inheritance and Variation

Match List-I with List-II. List-I List-II (A) Polygenic inheritance (I) ABO blood grouping in humans (B) Pleiotropy (II) Phenylketonuria (C) Multiple alleles (III) Human skin colour (D) Codominance (IV) AB blood group Choose the correct answer from the options given below:

Options

  1. A(A)-(II), (B)-(III), (C)-(I), (D)-(IV)
  2. B(A)-(III), (B)-(II), (C)-(I), (D)-(IV)
  3. C(A)-(III), (B)-(II), (C)-(IV), (D)-(I)
  4. D(A)-(II), (B)-(III), (C)-(IV), (D)-(I)

Correct answer

B. (A)-(III), (B)-(II), (C)-(I), (D)-(IV)

Step-by-step solution

Polygenic inheritance is controlled by three or more genes, and human skin colour is a classic example of it. Pleiotropy occurs when a single gene exhibits multiple phenotypic expressions. Phenylketonuria is an example of pleiotropy, where a mutation in the gene for the enzyme phenylalanine hydroxylase leads to mental retardation and a reduction in hair and skin pigmentation. Multiple alleles refer to the presence of more than two alleles for a gene in a population. ABO blood grouping in humans is controlled by thr

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