Biology
Grade-10
Easy
Question
Which is NOT an example of pleiotropy?
Marfan syndrome
PKU
Skin pigmentation
Vestigial gene in fruit flies
Marfan syndrome
PKU
Skin pigmentation
Vestigial gene in fruit flies
Hint:
Skin pigmentation
The correct answer is: Skin pigmentation
The major difference between the two is that pleiotropy is when one gene affects multiple characteristics (e.g. Marfan syndrome) and polygenic inheritance is when one trait is controlled by multiple genes (e.g. skin pigmentation).
Skin pigmentation is a classic example of a polygenic trait that has experienced directional selection in humans.
Human skin color is a “polygenic” trait, meaning multiple gene loci are involved in its expression.
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