Unlike what mendel observed in his pea plants, which were either tall or short, human height varies gradually over a range. why is this so?
a. multple genes contribute to human height
b. the gene controlling height is codominant
c. the gene controlling height displays incomplete dominance

A: Multiple genes contribute to human height

Explanation:

What Mendel observed in pea plants is generally considered to be exceptions to what is obtainable in most living organisms. Instead of segregating and assorting independently, a lot phenotypic expressions are as  a result of interaction of several genes on different loci (polygenic inheritance) while in some cases, multiple phenotypic expressions are controlled by a single gene.

Human height is a continuously varying character and has been studied to be controlled by multiple genes. In addition, the human height is often a result of complex interaction between genetics and the environment.

The correct answer is A.

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