In corn, two independent genes are involved in kernel color. When both dominant

Question

In corn, two independent genes are involved in kernel color. When both dominant alleles are present (C/- ; R/-), the color is purple; when either is recessive (C/- ; r/r or c/c ; R/-), the color is yellow; if both are recessive (c/c ; r/r) the color is white. You make a cross between a homozygous yellow plant that is know to have unstable color (i.e., you typically see yellow kernels with purple spots) due to an Ac insertion, and a homozygous white strain that lacks Ac elements. If you cross the resulting F1 offspring, what phenotypic ratio do you expect in the F2?

a) 9 yellow with purple spots: 3 white with yellow spots: 3 yellow with white spots: 1 white
b) 9 yellow with purple spots: 3 white with yellow spots: 3 yellow: 1 white
c) 9 yellow with purple spots: 3 white with purple spots: 3 yellow: 1 white
d) 9 yellow with purple spots: 3 purple with yellow spots: 3 yellow: 1 white
e) 12 yellow with purple spots: 3 yellow: 1 white

Explanation / Answer

From your data, homozygous white strain that lacks Ac elements will display the dominant color of yellow; therefore, b, 9 yellow with purple spots, 3 white with yellow spots, 3 yellow to 1 white will be displayed.

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