Summer squash plants with the dominant allele C bear white fruit, whereas plants

Question

Summer squash plants with the dominant allele C bear white fruit, whereas plants homozygous for the recessive allele c bear colored fruit. When the fruit is colored, the dominant allele G causes it to be yellow; in the absence of this allele (that is with genotype gg), the fruit color is green. What are the F2 phenotypes and their genotypes and the phenotypic proportions expected from intercrossing the progeny of a cross between CC GG and cc gg plants? Assume independent assortment of the C and G genes.

Explanation / Answer

CCGG x ccgg

The F2 progeny obtained are 12 (white):3 (yellow) :1(green)

Male/ female CG Cg cG cg CG CCGG (white) CCGg (white) CcGG (white) CcGg (white) Cg CCGg (white) CCgg (white) CcGg (white) Ccgg (white) cG CcGG (white) CcGg (white) ccGG (Yellow) ccGg (Yellow) cg CcGg (white) Ccgg (white) ccGg (yellow) ccgg (green)

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