In an owl, red spotting is recessive to gray, and the black vision gene completely suppresses the daytime

In an owl, red spotting is recessive to gray, and the black vision gene completely suppresses the daytime vision gene. In the offspring of the gray spotted owl, which saw well at night and poorly during the day, and the red spotted owl, which hunted only during the day, 8 owls appeared. Of these, one was homozygous. a) how many types of gametes are formed in a mother owl? b) how many different phenotypes can owls have? c) how many different genotypes can owls have? d) what is the probability that the owlet will look like its mother? e) how many owls will hunt at night?

Let’s designate the gene that causes gray spotting in owls as B, then the gene for red spotting of these birds will be b.

Let’s designate the gene for night vision of owls as C, then the gene for day vision will be c.

The red-headed spotted owl, which hunted during the day, will be recorded as bbcc, because for the phenotypic realization of the genes of both these traits, homozygosity for them of the genotype of the individual is necessary.

A homozygous owlet most likely means a digomozygote for recessive genes – bbcc.

For such an owlet to emerge from a gray spotted owl with night vision, it must be heterozygous for the genes of both traits. Let’s write it as BbCc, and the germ cells produced by it are bc, BC, bC and Bc.

Theoretically, the offspring of owls will look like this:

owlets with red spotting and daytime vision (bbcc) – 25%;

owlets with gray spot and night vision (BbCc) – 25%;

owlets with red spotting and night vision (bbСс) – 25%;

owlets with gray spot and daytime vision (Bbcc) – 25%.

a) in the gray owl – 4 types of gametes, in the red owl – 1 type;

b) 4 phenotypes;

c) 4 genotypes;

d) 25%;

e) 50%, or 4 owlets.