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NEETZoologyPrinciples of Inheritance and Variation

Which of the following traits or disorders in humans is a classic example of polygenic inheritance?

Options

  1. APhenylketonuria
  2. BSickle cell anaemia
  3. CHaemophilia
  4. DHuman skin colour

Correct answer

D. Human skin colour

Step-by-step solution

Polygenic inheritance refers to traits that are controlled by three or more genes. In humans, skin colour and height are classic examples of polygenic inheritance. Phenylketonuria is an example of pleiotropy, where a single gene mutation causes multiple phenotypic effects. Sickle cell anaemia and haemophilia are Mendelian disorders caused by mutation in a single gene. Answer: Human skin colour

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