Question

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

Answer 1

Answer:

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.