Use the following information to answer the questions below.
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.
-If 1,000 F₂ offspring resulted from the cross, approximately how many of them would you expect to have red, terminal flowers?
A) 65
B) 190
C) 250
D) 565
E) 750

Question

Quizplus · Accepted Answer

Given that the genes for flower color and location assort independently and considering the Mendelian inheritance, we can determine the expected phenotypic ratio for the F2 generation. Since all F1 individuals have red, axial flowers, they are heterozygous for both traits (Rr, Ax). The traits segregate independently, so we use the product rule to find the probability of each phenotype. For red flowers (R), the probability is 3/4 (RR or Rr), and for terminal flowers (x), the probability is 1/4 (since axial (Ax) is dominant and terminal (x) is recessive). Multiplying these probabilities gives 3/4 * 1/4 = 3/16. Out of 1,000 offspring, 3/16 would be expected to have red, terminal flowers, which is approximately 187.5, rounding to the closest option gives 190.

Use the Following Information to Answer the Questions Below