Question

8. Which pattern of inheritance is responsible for a wide range of phenotypes that result from individual organisms having many different gene pairs controlling a single trait?

Answer 1

The answer is D Multiple alleles 

Answer 2

The right answer is a polygenic trait.

A polygenic trait is a character that results from the expression of several genes. For example, in humans, size is a polygenic trait.

Some diseases such as chronic diseases and cancers are polygenic in nature, ie several genes are involved for the disease to express itself (or not).