The yellow-grain rye variety is crossed with the white-grain one; in F1 all plants were with green seeds

The yellow-grain rye variety is crossed with the white-grain one; in F1 all plants were with green seeds, and in F2 they were split by color: 89 seeds were green, 28 were yellow, and 39 were white. What are the genotypes of the parents? Please provide relevant evidence. How is this trait inherited? Please provide relevant statistical evidence.

Since the crossing of plants with two different colors of seeds gave the appearance of offspring with seeds of the third color, it should be concluded that the inheritance of this trait is intermediate. Since all F1 plants have green seeds, a conclusion should be made about the homozygosity of the parent plants, that is, about the purity of their lines.

Let’s designate the gene that causes the yellow coloration of rye grains as C, and the gene that causes the white coloration of the grains of this plant as c.

Rye with yellow seeds will be recorded as CC, the germ cells produced by it – as C. Rye with white seeds – cc, its germ cells – c.

Green grains will be observed in F1 hybrids with a heterozygous Cc genotype. These hybrids are capable of producing germ cells of two types – C and c.

The theoretically possible offspring from crossing hybrid rye with each other will be represented by the following options:

rye with yellow grains (CC) – 25%;

rye with green grains (Cc) – 50%;

rye with white grains (cc) – 25%.

The resulting percentage corresponds to a 1: 2: 1 ratio.

The numerical values ​​of the rye plant seeds of different colors actually obtained in F2 also correspond to the theoretically found proportion (28:89:39), which confirms the assumption of the intermediate nature of the inheritance of seed color in rye.