Mendel performed a cross between two individuals, each heterozygous for three different traits controlled by unlinked genes: Green versus yellow seeds (green is dominant), red versus white flowers (red is dominant), and green versus yellow pods (green is dominant).Of the 64 offspring, how many had green seeds, red flowers, and green pods?
A) 3
B) 6
C) 9
D) 12
E) 27

Question

Quizplus · Accepted Answer

For each trait, the heterozygous cross will result in a 3:1 ratio of dominant to recessive phenotypes. Since the genes are unlinked, the probability of each dominant phenotype is 3/4. The probability of an offspring having all three dominant phenotypes is (3/4) * (3/4) * (3/4) = 27/64. With 64 offspring, 27/64 * 64 = 27 offspring will have green seeds, red flowers, and green pods.

Mendel Performed a Cross Between Two Individuals, Each Heterozygous for Three