In Mirabilis (Four-O’ clock plant), two genes, Y and R,affect flower colors. Nei

Question

In Mirabilis (Four-O’ clock plant), two genes, Y and R,affect flower colors.
Neither is completely dominant and they interact with each other toproduce 7 flower colors-

RRYY = crimson      YyRR =magenta       YYRr =Orange-red      YyRr = magenta-rose
Yyrr = yellow      Yyrr = paleyellow        yyRR, yyRr andyyrr = white

Two four-O’ clock plants were crossed and gave the followingoffspring-

1/8 crimson, 1/8 orange-red, 1/4 magenta, 1/4 magenta-rose, 1/4white.

What are the genotypes and flower colors of the 2 parentplants?

Explanation / Answer

The genotypes for the two parents are YyRr (magenta-rose) and YyRR(magenta) you end with a  1:2:2:2:1 phenotype if you do a punnet square which gives you the proper ratios in the above problem. You just have two different white genotypes but they still display the correct phenotype.

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