Problem

Two true-breeding pea plants were crossed. One parent is round, terminal, violet, constric...

Two true-breeding pea plants were crossed. One parent is round, terminal, violet, constricted, while the other expresses the respective contrasting phenotypes of wrinkled, axial, white, full. The four pairs of contrasting traits are controlled by four genes, each located on a separate chromosome. In the F1 only round, axial, violet, and full were expressed. In the F2, all possible combinations of these traits were expressed in ratios consistent with Mendelian inheritance.

(a) What conclusion about the inheritance of the traits can be drawn based on the Fj results?


(b) In the F2 results, which phenotype appeared most frequently? Write a mathematical expression that predicts the probability of occurrence of this phenotype.


(c) Which F2 phenotype is expected to occur least frequently? Write a mathematical expression that predicts this probability.


(d) In the F2 generation, how often is either of the P1 phenotypes likely to occur?


(e) If the F1 plants were testcrossed, how many different phenotypes would be produced? How does this number compare with the number of different phenotypes in the F2 generation just discussed?

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