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