30. If 2 genes C and P controlling the production of flower pigment are involved

Question

30. If 2 genes C and P controlling the production of flower pigment are involved in the pathway shown below where anthocyanin is a purple pigment and the precursor and intermediate do not produce the anthocyanin and are white which of the following ratios of progeny phenotypes in the F2 generation would most probably arise from a cross of the 2 white parents with genotypes CCpp X CCPP? Gene PrecursorIntermedite Anthocyanin Genotype C-P- C-PP cC pp A) 8 purple:8 white B) 15 purple:1 white C) 12 purple: 4 white D) 4 purple: 12 white E) 9 purple:7 white

Explanation / Answer

E) 9:7

This is a case of complementary gene interaction or recessive epistasis where the two genes controlling the phenotype compliment each other and both need to be present atleast in heterozygous form to give the desired phenotype.

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