In tomato, the gene for red fruit color dominates over the gene for yellow color, and the gene for normal plant

In tomato, the gene for red fruit color dominates over the gene for yellow color, and the gene for normal plant growth over the gene for dwarfism. The genes are not linked. Plants of normal growth with red fruits (pure line) were crossed with dwarf yellow-fruited. The resulting P1 offspring were crossed again with dwarf yellow-fruited. What are the genotypes and phenotypes of plants in F1 and F2

Let’s designate the gene that causes the red color of tomato fruits as C, then the gene for yellow-fruited tomatoes will be c. Let’s designate the gene responsible for the normal growth of tomatoes as D, then the gene for dwarf tomatoes will be d.

A clean line of normal growth red tomatoes will be CCDD; such plants will produce the same type of CD gametes.

Yellow-fruited dwarf tomatoes – ccdd – will also produce uniform gametes – cd.

All plants obtained as a result of crossing the indicated tomatoes will be red-fruited with normal growth – CcDd, and produce four types of gametes: CD, cd, cD, Cd.

In the offspring of these hybrids, obtained by crossing them with dwarf yellow-fruited tomatoes, there will be the following plant options:

tomatoes with red fruit and growth rate (CcDd) – 25%;

dwarf yellow-fruited tomatoes (ccdd) ​​- 25%;

yellow-fruited tomatoes with a growth rate (ccDd) – 25%;

dwarf red-fruited tomatoes (Ccdd) – 25%.