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Question
In tomato plants, red skin color (R) is dominant to yellow skin color (r). A red-skinned tomato plant was crossed with a yellow-skinned tomato plant, and the following proportion of F1 offspring resulted: 79 red-skinned tomatoes, 68 yellow-skinned tomatoes.
What were the genotypes of the P generation?
In tomato plants, red skin color (R) is dominant to yellow skin color (r). A red-skinned tomato plant was crossed with a yellow-skinned tomato plant, and the following proportion of F1 offspring resulted: 79 red-skinned tomatoes, 68 yellow-skinned tomatoes.
What were the genotypes of the P generation?
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Solution
The correct option is D Rr and rr
R is the gamete for red color and r is the gamete for yellow skin color. Red color is dominant to yellow color and almost equal number of red and yellow skinned tomatoes are obtained. Both these phenotypes in F1 generation will be expressed if a cross is made between the genotypes Rr and rr as shown in the Punnett square. Thus the correct answer is option D.
R is the gamete for red color and r is the gamete for yellow skin color. Red color is dominant to yellow color and almost equal number of red and yellow skinned tomatoes are obtained. Both these phenotypes in F1 generation will be expressed if a cross is made between the genotypes Rr and rr as shown in the Punnett square. Thus the correct answer is option D.
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