Question

which of the following examples best define multiple alleles?
a pea plants have different genes that code for various different traits such as shape, size, height, and flower color.
b the wing size of drosophila flies is controlled by three alleles.
c snapdragon flowers have three genotype combinations for red, pink, or white coloration.
d there are over eight genes that influence human eye color.

Explanation:

Multiple alleles refer to a gene having more than two alleles. Option b mentions three alleles controlling a trait (wing size of drosophila flies), which fits the concept of multiple alleles. Option a is about different genes for different traits. Option c is about incomplete dominance (snapdragon flower color). Option d is about polygenic inheritance (multiple genes influencing eye color).

Answer:

B. The wing size of drosophila flies is controlled by three alleles.