Name: 1. A pathway for biosynthesis of flower petal pigments has two colored int

Question

Name: 1. A pathway for biosynthesis of flower petal pigments has two colored intermediates and a red-colored end product. Flowers are white if neither pigment is made. If the unlinked genes A, B, C, and D control enzymes acting at the steps shown, and if the recessive alleles a, b, c, and d encode inactive forms of these enzymes, respectively, what phenotypic classes would appear among the progeny from inbreeding each of the four following dihybrid plants? A. AaBb B. BbCc C. CcDd D. AaDd E. Write the probability of each of the following phenotypes from selfing of tetrahybrid AaBbCcDd F1 plants: Red Orange Blue White

Explanation / Answer

As the given data, flower colour formation is a stepwise pathway in which each dominant gene produce a active protein in the intermediate ,which ultimately give rise to red colour to the flower.

(A-D)= intercrossing between dihybrid like (AaBb×AaBb) not produce any full pigment and all plants become white.

(E) probability of red colour is highest then orange,blue and least in case of white.

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