Summer squash plants with the dominant allele C bear white fruit, whereas plants homozygous for the recessive allele c bear colored fruit. Summer squash have a second locus that acts as a modifier gene if the plant is colored. IF the plant is colored and is G-- at the second locus, they will be yellow. If they are colored and gg at the second locus, they will be green. What will the ratio of white to yellow to green squash be in a cross between a double heterozygous plant and a double homozygous recessive plant (CcGg x ccgg)?
a. 4:3:1
b. 2:1:1
c. 9:3:3:1
d. 1:4:6:4:1
Answer: b. 2:1:1
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