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Question

How many phenotypes can be expected from a polygenic inheritance pattern for a character involving three gene pairs?

A
3
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B
6
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C
8
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D
7
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Solution

The correct option is D 7
If the occurrence of a trait is controlled by several genes, then the inheritance pattern it follows is polygenic inheritance.
Unlike Mendelian trait inheritance, it is a quantitative trait that is formed by cumulative effects of the intermediate genes as well.
There is a numerical formula that is used to calculate the number of phenotypes in polygenic inheritance = 2n+1
Where n = number of gene pairs involved
In the given question, n=3
(2×3)+1
7
Therefore, 7 different types of phenotypes can be expected in the progeny.

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