01:960:285 Lecture 4: Chatper 3 Coniditonal Proabbility (pg 3)
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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 âpotatoâ (Po) leaves. The results for 3 matings of tomato-plant phenotypes are as follows: (2)
This question is all over the internet except it ususlly comes with five matings. This version has 3 matings. It is easy to determine that cut is dominant to potato but I cannot figure out how to justify dominance of color. I need an example, from the mating data, to justify the dominace of either green or purple.
| Number of Progeny with Phenotype | ||||
Mating | Parental phenotype | P, C | P, Po | G, C | G, Po |
1 | P,C X G,C | 321 | 101 | 310 | 107 |
2 | P, C X G, Po | 404 | 0 | 387 | 0 |
3 | P, Po X G, C | 70 | 91 | 86 | 77 |
Based on the information provided in the table determine which alleles are dominant.
What are the most probable genotypes for the parents in each cross?
Possible genotype | |
Mating 1 | |
Parental phenotype 1: P,C | |
Parental phenotype 2 : G, C | |
Mating 2 | |
Parental phenotype 1: P,C | |
Parental phenotype 2 : G,Po | |
Mating 3 | |
Parental phenotype 1: P,Po | |
Parental phenotype 2 : G,C |