In tomato, the red color of the fruit dominates over the yellow color, and the round shape of the fruit dominates

In tomato, the red color of the fruit dominates over the yellow color, and the round shape of the fruit dominates the pear-shaped one. As a result of crossing plants heterozygous for two genes with plants that have yellow and pear-shaped fruits, 280 offspring were obtained. How many of them will have yellow round fruits.

Let A – red fruits, then a – yellow; B is the round shape of the fruit, then b is pear-shaped.

PP g AaBb (k, k) x ma aab (g.g)

m / f ab AB AaBb (c.k) Av Aabbb (k, d) aB aaBb (g, j) av aabbb (g, d)
By phenotype:

25% – red, round;

25% are red, pear-shaped;

25% – yellow, round;

25% are yellow, pear-shaped.

Cleavage phenotype 1: 1: 1: 1. Therefore, if in the offspring 280 plants have yellow fruits and pear-shaped fruits, then yellow round fruits will also have about 280 plants.

Answer: 280 plants.