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

Skin colour in humans.

The correct answer is Option (4) -Skin colour in humans.

Skin color in humans is an example of polygenic inheritance. Polygenic inheritance involves the influence of multiple genes on a single phenotypic trait.

Polygenic inheritance is an inheritance pattern controlled by three or more genes (multiple genes) and the graded phenotypes are due to the additive or cumulative effect of all the different genes of the trait. An example of human skin colour to understand the phenomenon of polygenic inheritance.