Problem: In tomatoes, red fruit color is dominant to yellow. A red fruit plant is crossed with anoter red fruit plant and the crosses produces 30 red fruit plants and 10 yellow fruit plants. Use the symbols R/r for fruit color.a. Prepare a Punnet square to illustrate the cross.b. What is the chance that red fruit plants are homozygous dominant? Show your work.

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From the given problem, two dominant phenotypes were crossed producing offspring that are 3 : 1 in its phenotypic ratio of dominant to recessive. The presence of the recessive phenotype suggests that the parents are both heterozygous.

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Problem Details

In tomatoes, red fruit color is dominant to yellow. A red fruit plant is crossed with anoter red fruit plant and the crosses produces 30 red fruit plants and 10 yellow fruit plants. Use the symbols R/r for fruit color.

a. Prepare a Punnet square to illustrate the cross.

b. What is the chance that red fruit plants are homozygous dominant? Show your work.

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Based on our data, we think this problem is relevant for Professor Cooper's class at UCSD.