When two varieties of tomato are crossed with red spherical and yellow pear-shaped fruits in the first generation, all fruits are spherical, red. Identify the genotypes of parents, hybrids of the first generation, the ratio of phenotypes of the second generation.
1) Parent genotypes: red spherical fruits – AABB, yellow pear-shaped fruits – aabb.
2) F1 genotypes: red spherical AaBb.
3) The ratio of phenotypes F2:
9 – red spherical,
3 – red pear-shaped,
3 – yellow spherical,
1 – yellow pear-shaped.
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