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)
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.
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