3) In tomatoes, one gene determines whether the plant has purple (P) or green (G

Question

3) In tomatoes, one gene determines whether the plant has purple (P) or green (G) stems, and a separate, independent gene determines whether the leaves are "cut" (C) or potato" (Po) Five matings of tomato-plant phenotypes give the following results: Number of progeny Mating Parental phenotypes 1 2 3 4 P, C P, Po G. C G. Po 323 102309 220 206 723 229 4050 106 72 P,CXP, Po P. C x G, C 65 389 908578 Di P. Po X G, C 71 a. Which alleles are dominant? b. What are the most probable genotypes for the parents in each cross?

Explanation / Answer

Answer:

3. (a) Cross 2 indicates that purple (G) is dominant to green (g), and cross 1 indicates that cut (P) is dominant to potato (p).

(b) Cross 1: G/g; P/p' x g/g; P/p There are 3 cut :1 potato, and 1 purple :1 green.

Cross 2: G/g; P/p' x G/g; p/p There are 3 purple :1 green and 1 cut :1 potato.

Cross 3: G/G; P/p' x g/g; P/p There are no green, and there are 3 cut :1 potato.

Cross 4: G/g; P/P' x g/g; p/p There are no potatoes, and there are 1 purple :1 green.

Cross 5:G/g; p/p' x g/g; P/p There are 1 cut:1 potato, and there are 1 purple :1 green.

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