A key difference between single gene traits, such as those Mendel studied, and complex traits, such as human height, is that: complex traits are generally not significantly influenced by the environment, whereas single gene traits have a significant environmental component. complex traits show incomplete dominance, whereas single gene traits show complete dominance. None of the other answer options are correct. single gene traits are generally not significantly influenced by the environment, whereas complex traits have a significant environmental component. single gene traits show both complete and incomplete dominance, whereas complex traits show only complete dominance.

single gene traits are generally not significantly influenced by the environment, whereas complex traits have a significant environmental component

Explanation:

Single gene traits that are controlled by a locus, that is two alleles of a trait controls the expression of a character. Single gene traits are said to be involved in Mendelian inheritance. These traits are not all significantly influenced by environmental factors. On the other hand, complex traits, such as height in humans, which is controlled by 10 or more allelic pairs, have been found to be significantly influenced by environmental components like diet. This explains why the expression of height in human population is widely varied, and when each individual’s height of a population is plotted on a graph, we would see a normal distribution curve with a bell curved shape.

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