In peas, the yellow color dominates over the green, homozygous and heterozygous were crossed.

Let us designate the gene that causes the formation of yellow seeds in peas as C, then the gene that causes the green coloration of pea beans in the homozygous state will be designated as c.

Heterozygous peas (Cc) will produce yellow seeds and produce C and C germ cells.

Homozygotes can be both for the C gene and for the c gene. Let’s consider both options.

Plants homozygous for the gene of the dominant trait produce sex cells – C. When crossed with the above-described heterozygous plant, the offspring will be obtained, which has the following appearance: CC – 50%, yellow beans, Cc – 50%, yellow beans;

Plants homozygous for the recessive gene – cc, the same type of germ cells produced by them – c. From crossing with heterozygous peas we get the following options: Сс – 50%, a plant with yellow beans; ss – 50%, peas with green beans.