The genes for the red color and rounded shape of tomatoes are dominant. A tomato with yellow round

The genes for the red color and rounded shape of tomatoes are dominant. A tomato with yellow round fruits was crossed with a tomato having red oval fruits. As a result, the offspring turned out to be four different phenotypic forms, and in a ratio of 1: 1: 1: 1. Determine the genotypes of the parents and offspring

Let’s designate the gene for the dominant red color of tomatoes as K, and the gene for their round shape – as L. Accordingly, the genes for the yellow color of tomatoes and their oval shape will be designated as k and l.

Since the offspring produced tomatoes with oval-shaped and yellow fruits, possessing genotypes ll and kk homozygous for recessive genes, and they inherit recessive genes from both parental plants, it should be concluded that the parental plants are heterozygous for those traits by which they demonstrate in phenotypes dominant signs.

Thus, a tomato with yellow round fruits is heterozygous in fruit shape and has the kkLl genotype. It is capable of producing two types of germ cells – kL and kl.

A tomato with red oval fruits is heterozygous for fruit color and has the Kkll genotype. It produces two types of germ cells – Kl and kl.

Offspring includes the following options:

tomatoes with a round red fruit (KkLl) – 25%;

tomatoes with a round yellow fruit (kkLl) – 25%;

tomatoes with red oval fruit (Kkll) – 25%;

tomatoes with yellow oval fruit (kkll) – 25%.

The theoretically obtained percentage of the phenotypes of the offspring corresponds to the proportion indicated in the problem statement.