Gray astrakhan fur (shirazi) is more beautiful and more valuable than astrakhan fur (black).

Gray astrakhan fur (shirazi) is more beautiful and more valuable than astrakhan fur (black). What kind of sheep in wool color and why is it economically profitable to select for crossing in order to simultaneously get as many gray and black karakul lambs as possible. It is known that homozygous gray individuals are lethal due to the lethality of the dominant gene for gray fur coloration in a homozygous state.

From the conditions of the problem it follows that gray fur is a dominant feature, black fur is recessive.

A is gray, a is black.

AA lambs die, Aa gray, aa black.

If you cross grays among themselves, then in the offspring there will be individuals of both colors, as well as stillborn ones. When blacks are crossed, all offspring will be black.

Therefore, it is necessary to cross sheep of different colors among themselves:

Parents: Aa x aa,

Gametes: A, a x a,

Lambs: Aa (gray), aa (black).

The ratio of genotypes and phenotypes is 1: 1, which means that half of the offspring will be black, half will be gray.