In cockroaches, the black color of the coat is recessive to the red color, the long bristles

In cockroaches, the black color of the coat is recessive to the red color, the long bristles are above the short ones. Determine f1 and f2 obtained from crossing animals: a – black long-bristled with red short-bristled.

Let’s designate the gene that causes the black color of cockroaches as c, then the dominant gene for the red color will be C.

Let’s designate the gene for long bristles of cockroaches as p, then the gene for short bristles will be P.

The black long-bristled cockroach will be recorded as ccpp, since homozygosity is necessary for the realization of recessive traits. It produces sex cells cp.

Most likely, the problem implies homozygosity for both pairs of traits of a red short-bristled cockroach. Let’s write it as CCPP, and the gametes it produces as CP.

F1 offspring will look like this: СсРp, all cockroaches will be red with long bristles.

They will produce sex cells cp, cp, cp and cp.

F2 offspring will be represented by the following options:

red long-bristled cockroaches (ССРР, 2СсРР, 2ССРp, 4СсРр);

red short-bristled cockroaches (2Срр, ССрр);

black long-bristled cockroaches (ссРP, 2ссРp);

black short-bristled cockroaches (ccpp).