In tomatoes, the red color of the fruit dominates over the yellow and the round shape of the fruit

In tomatoes, the red color of the fruit dominates over the yellow and the round shape of the fruit over the pear-shaped. They crossed a heterozygous plant with red in color and pear-shaped fruits and a heterozygous plant with yellow round-shaped fruits. Determine what will be the first generation hybrids by genotype and phenotype?

Let’s designate the gene that causes the red color of tomatoes as B, then the gene that leads to the development of yellow fruits will be b.

Let’s designate the gene that leads to the development of round tomatoes as C, then the gene for pear-shaped fruits will be c.

Tomatoes with red pear-shaped fruits are, according to the condition, heterozygous. Let’s write them Bbcc. According to the second trait, they are homozygous, since otherwise the pear-shaped form cannot be phenotypically realized. Such tomatoes produce sex cells Bc and bc.

Plants with yellow round fruits are, according to the condition, also heterozygous. Let’s write them as bbСс, because according to the first (recessive) trait, they must be homozygous. Such plants produce bC and bc germ cells.

In the offspring from crossing the above-described plants with each other, the following options will be presented:

tomatoes with a red round fruit (BbCc) – 25%;

tomatoes with a yellow round fruit (bbСс) – 25%;

tomatoes with red pear-shaped fruit (Bbcc) – 25%;

tomatoes with a yellow pear-shaped fruit (bbcc) – 25%.