In Drosophila, gray body coloration and normal wings dominate, while the black body and rudimentary

In Drosophila, gray body coloration and normal wings dominate, while the black body and rudimentary wings are recessive. When two gray flies with normal wings were crossed, offspring were obtained, all individuals of which were gray and had normal wings. Determine the genotypes of the parents, if possible.

Let’s designate the gene that determines the development of the gray body in Drosophila as B, then the gene for the black body will be b.

Let’s designate the gene of the normal wing of Drosophila as C, then the gene of the embryonic wing will be c.

Gray flies with normal wings can be represented by the following genetic variants: BBCC, BbCc, BBCc and BbCC.

The sex cells of the parental individuals could have the form: ВС, bС, Вс, bс.

Thus, the flies-parents could be carriers of recessive genes, however, in order to prevent two genes of a recessive trait from converging in the genotypes of the offspring, one of the parent individuals must be homozygous for one or another dominant trait.

Also, both parental individuals can be homozygotes for the dominant genes – BBCC.

Answer: parental individuals of Drosophila could be represented by the following variants: BBCc and BbCC; 2 BBCC; BBCC and BBCC.