The white flower was pollinated with red pollen. Find the genotypes of the parental forms F1; F2.

Since the condition does not indicate the nature of the inheritance of the color of the corolla of flowers, it should be assumed that this implies the complete dominance of one color over another.

Let’s say the red color of the corolla dominates over the white.

Let’s designate the gene for the red color of the corolla of the flower as B, then the gene for the white color will be designated as b.

The white flower will have a homozygous genotype cc, because only in this case the recessive trait can be phenotypically realized. Such a flower produces germ cells b.

Suppose a flower with a red corolla is homozygous – BB, then it produces the same type of germ cells B.

All F1 from crosses of these colors will be Bb heterozygotes with a red corolla. All of them produce germ cells of two types – b and B.

In F2 we get the following options:

homozygous plants with a red corolla (BB) – 25%;

plants with a white corolla (bb) – 25%;

heterozygous plants with a red corolla (2Bb) – 50%.