Black color of cattle wool dominates over red. A black bull was crossed with a red cow. Determine all possible

Black color of cattle wool dominates over red. A black bull was crossed with a red cow. Determine all possible options for obtaining offspring. (Hint: Remember what an analyzing cross is. And for what purpose it is done).

Let’s designate the gene that causes the black color of cattle fur as C, and the gene for red color as c. A black bull, as the owner of a dominant trait, can be both homo-, ta and heterozygous – Cc or CC, respectively. The red cow will have the homozygous cc genotype. Let’s consider both options.

Let the black bull be homozygous – CC. It produces sperm of the same type – C. Red cow – cc, produces eggs – c. All calves have the Cc genotype, which is outwardly manifested in the development of black wool;

Let the black bull be heterozygous – Cc. It produces two types of sperm – C and C. From crossing with a red cow, the following offspring options are possible: heterozygous Cc calves with black wool – 50%; homozygous red-haired calves cc – 50%.

Such a crossing is called analyzing, it is carried out in order to determine the purebredity of the analyzed individual, which has a dominant phenotype. If there is no cleavage in the offspring, then the analyzed animal is purebred (homozygous for the gene for the dominant trait).