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Which one of the following is an example of polygenic inheritance?

1. Production of male honey bee
2. Pod shape in garden pea
3. Skin colour in humans
4. Flower colour in Mirabilis jalapa

Correct answer: Skin colour in humans

Solution

Skin colour in humans is polygenic because several genes contribute small additive effects to the final phenotype. This creates a wide range of shades rather than just a few discrete classes.

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