In cosmos plants, purple stem (A) is dominate to green stem and short petals (B)

Question

In cosmos plants, purple stem (A) is dominate to green stem and short petals (B) is dominant to long petals (b), in a simulated cross, AABB plants were crossed with aabb plants to generate F1 (AaBb), which were then crossed (AaBb X aabb) 900 offspring plants were 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 ration of 1:1:1:1, calculate the expected number of each phenotype out of the 900 total offspring. Drag the correct values data table. Labels may be used once, more than once, or not at all.

Explanation / Answer

The answer will be 225. Since the total number of offsprings are 900 and the ratio between all the four phenotypic classes is 1:1:1:1. The number of offsprings in one class will be 1/4 X 900 = 225.

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