The following list contains possible combinations for pea plant seed shape. round (r) is a dominant trait, and wrinkled (r) is a recessive trait. choose the combination(s) that would result in a plant with wrinkled seeds. select all that apply
a. rr
b. rr
c. rr

Wrinkled seeds are associated with a a recessive trait, which means that in order for this trait to be expressed, both versions of the gene need to have the "wrinkled" form in them: otherwise the dominant trait would be expressed.

the correct answer is that only the combination rr would result in a plant with wrinkled seeds. 

There would be one bar shorter than the bar for peaches.