Problem 5. In tomatoes, two alleles of one gene determine the character differen

Question

Problem 5. In tomatoes, two alleles of one gene determine the character difference of purple (P) versus green (G) stems, and two alleles of a separate, independent gene determine the character difference of "cut" (C) versus "potato" (Po) leaves. The results for five crosses of tomato-plant phenotypes are as follows Number of progeny P, C P, Po G, C G, Po 321 101 310 107 219207 64 722 231 0 404 0 70 Color Shape Probab Parental phenotypes P, C x G, OC P, C × P, PO Genotypes 71 0 P, C×G,Po P' Po × G, C Which color is dominant? 387 0 91 86 Which shape is dominant? For each cross in the table write down the most probable genotypes using A/a and B/b symbols for colorlpurple:green) and shape (cut:potato), respectively Do the two genes segregate independently? For each cross and character, indicate the phenotypic segregations in the Color and Shape columns In the column Probab indicate, for each cross, the probability of getting P, Po progeny

Explanation / Answer

1. Dominant - Purple and Cut

Yes It is independent assortment.

Genotype                                        Color                 Shape                                      Probability

1. PpCc X ppCc         Purple, Green              Cut                                             0.24

2. PpCc X Ppcc                        Purple                        Cut, Potato                                  0.49

3. PPCc X ppCc                     Purple, Green              Cut                                               0.24

4. PpCC X ppcc                     Purple, Green              Cut, Potato                                   0

5. Ppcc X ppCc                      Purple, Green              Cut, Potato                                   0.51

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