Question

In cosmos plants, purple stem (a) is dominant to green stem (a), and short petals (b) is dominant to long petals (b). in a simulated cross, aabb plants were crossed with aabb plants to generate f1 dihybrids (aabb), which were then test crossed (aabb x aabb). 900 offspring plants were scored for stem color and flower petal length. the hypothesis that the two genes are unlinked predicts the offspring phenotypic ratio will be 1:1:1:1. using the ratio of 1:1:1:1, calculate the expected number of each phenotype out of the 900 total offspring. drag the correct values onto the data table. labels may be used once, more than once, or not at all.

Answer 1

In a simulated cross where plants AABB were crossed to create an F1 dihybrid (AaBb) which was then crossed with another set of plants (AaBb X aabb) would yield the following expected number of offspring (900 plants): 225, 225, 225, 225.