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Two true-breeding stocks of pea plants are crossed. One parent has red axial flowers and the other has white terminal flowers; all F1 individuals have red axial flowers. The genes for flower color and location assort independently.
-Among the F2 offspring, what is the probability of plants with white axial flowers?

Question

Quizplus · Accepted Answer

The F1 generation from the cross of the two true-breeding stocks of pea plants had red axial flowers which means they were heterozygous (Rr) for the flower color gene. The F1 generation was then crossed to produce the F2 generation.

The F2 generation will have a phenotypic ratio of 3:1 for axial red flowers (RR or Rr) to terminal white flowers (rr) because the genes for flower color and location its independent law.

Out of the 3:1 ratio, 1/4 of the F2 offspring will have white flowers and 2/4 will have red axial flowers. Therefore, the probability of plants with white axial flowers is 1/4 of 1/4 which is equal to 1/16. Since we are looking for the probability of white *axial* flowers, we need to multiply 1/16 by 3 to get the probability of 3/16. Therefore, the answer is C) 3/16.

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