In rabbits, the shaggy fur gene dominates over smooth fur. From crossing hairy males and females, 745 hairy

In rabbits, the shaggy fur gene dominates over smooth fur. From crossing hairy males and females, 745 hairy and 240 smooth offspring were obtained. Determine genotypes and cross.

Let’s designate the gene that determines the development of shaggy fur as M, then the gene that leads to the development of smooth fur will be m. Smooth fur only gets the opportunity to manifest itself outwardly when the gene that causes it is presented as a homozygote mm.

Since rabbits with smooth hair were obtained in the offspring of these females and males, it should be concluded that the parental individuals of rabbits are heterozygous, which are furry, but contain hidden recessive genes in their genotype.

The parent of the rabbits, so – Mm, they produce sperm and eggs M and M.

The offspring looks like this:

hairy rabbits (MM and MM) – 75%;

rabbits with smooth hair (mm) – 25%.

The obtained proportions satisfy the actually obtained numerical results (745 furry and 240 smooth rabbits).