When crossing a tomato with a purple stem (A) and red fruits (B) and a tomato with a green stem and red fruits, 722 plants

bystudin | May 29, 2020 | Education

When crossing a tomato with a purple stem (A) and red fruits (B) and a tomato with a green stem and red fruits, 722 plants with a purple stem and red fruits and 231 plants with a purple stem and yellow fruits were obtained. Make a diagram of the solution to the problem. Determine the genotypes of parents, first-generation offspring and the ratio of genotypes and phenotypes in offspring.

1) Parent genotypes: purple stem, red fruits – AABb (gametes: AB and Ab); green stem, red fruits – aaBb (gametes aB and ab);
2) progeny genotypes in F1: AaBB, AaBb, Aabb;
3) the ratio of genotypes and phenotypes in F1:
purple stem, red fruits – 1 AaBB: 2 AaBb
purple stem, yellow fruits – 1 Aabb.

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