In the ADABarba plant the synthesis of pink pigment in the p

In the ADABarba plant the synthesis of pink pigment in the petals is controlled by two genes, s and K. (Unless told otherwise, you can always assume that all other genes in a pathway are homozygous WT in these individuals.) The pathway is... a. If a pure breeding plant was unable to catalyze the first reaction, what color of petals would you expect to see? b. If a pure breeding plant was unable to catalyze the second reaction, what color of petals would you expect to see? c. If the plants from parts a and b were crossed, what color petals will these F1 offspring plants have? d. What would be the expected phenotypic ratios in a cross between F1 plants? Make sure you include phenotypic class information with your ratios.

Solution

Please find the answers below.

1. If no reaction is expected, then we can see yellow pigment as it is dominant.

2. If the plant is unable to catalyze the second reaction, still we see yellow pigment as it is dominant.

3. Pink color petals is seen.

4. The expected phenotypic ratio is 1:2:1