MCB 300 Lecture 27: 27
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2 Apr 2019
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In tomatoes, two alleles of one gene determine the character difference of purple versus green stems, and two alleles of a separate, independent gene determine the character difference of âcutâ versus âpotatoâ leaves. Please use the allele notation of G for stem color and P for leaf shape. The results for four matings of tomato plant phenotypes are as follows:
number of progeny with particular phenotype
mating | parental phenotype | green and cut | green and potato | purple and cut | purple and potato |
1 | green & potato x purple & cut | 197 | 202 | 195 | 206 |
2 | Green & Cut à Green & Potato | 197 | 199 | 0 | 0 |
3 | Purple & Cut à Green & Cut | 0 | 0 | 281 | 0 |
4 | Purple & Potato à Purple & Potato | 51 | 148 | 153 | 448 |
What are the most probable genotypes for the parents in each cross?