In eggplant, the dark blue color of the fruit is manifested only if the genotype contains two dominant

In eggplant, the dark blue color of the fruit is manifested only if the genotype contains two dominant genes – D and P. For all other combinations of dominant and recessive alleles of these genes, plants have white fruits. What offspring can be expected from two white-fruited plants, the first of which is heterozygous for the D gene, and the second for the P.

Let us write down the genotypes of the parent plants according to the designations introduced in the problem statement. A white-fruited eggplant heterozygous for the D gene will be Ddpp, it will produce Dp and dp germ cells.

A white-fruited eggplant heterozygous for the P gene will ddPp, and will also produce two types of germ cells: dP and dp.

Crossing such eggplants with each other will lead to the following offspring options:

eggplant with dark blue fruits (DdPp) – 25%;

white-fruited eggplants (ddPp, Ddpp, ddpp) – 75%.