Multiple choice

What will be the number of phenotypes in polygenic inheritance in case of human skin color?

  1. 7

  2. 11

  3. 3

  4. 5

  5. None of the above
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A Correct answer
Explanation

Number of phenotypes in polygenic inheritance is calculated by = ( 2 x n ) + 1, where n is number of pairs of polygene. As human skin color is controlled by 3 pairs of polygenes, thus number of phenotypes = ( 2 x 3 ) + 1 = 7. Also, phenotypic ratio for human skin color is 1 : 6 : 15 : 20 : 15 : 6 : 1. So, if counted, the answer is 7.

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