2. Two true-breeding pea plants are crossed. One parent is round, terminal, viol

Question

2. Two true-breeding pea plants are crossed. One parent is round, terminal, violet, constricted, while the other expresses the contrasting phenotypes of wrinkled, axial, white, full. The four pairs of contrasting traits are controlled by four genes, which will assort independently of each other. In the F1 generation, only round, axial, violet, and full are expressed. In the F2 generation, all possible combinations of these traits are expressed in ratios consistent with Mendelian inheritance.
(a) What conclusion can you draw about the inheritance of these traits based on the F1 results?
(b) Which phenotype appears most frequently in the F2 results? Use the probability method to predict the frequency of occurrence of this phenotype.
(c) Which F2 phenotype is expected to occur least frequently? Use the probability method to predict the frequency of occurrence of this phenotype.
(d) How often is either P1 phenotype likely to occur in the F2 generation?
(e) If the F1 plant is testcrossed, how many different phenotypes will be produced, and how does this number compare to the number of different phenotypes in the F2 generation discussed in part (b)?

Explanation / Answer

A)

Round Axial Violit Full

B)

Round Axial Violet, Full; 3/4 x 3/4 x 3/4 x 3/4

C)

wrinkled, terminal, white, constricted; 1/4 x 1/4 x 1/4 x 1/4

D)

4 normal; 4 albino

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