Two nonaline genes are responsible for the color of the fur in rabbits: the gene for the presence of pigment in the hair (C) and the gene for the uniform distribution of pigment along the hair (R) Determine the ratio of black, white and gray rabbits in F1, when crossing a black diheterozygous rabbit and a white homozygous rabbit.
Two non-allelic genes are responsible for coat color in rabbits:
С – gene for the presence of pigment, с – absence of pigment;
G – uniform distribution of the pigment, g – uneven.
Then, in the presence of two dominant genes, the color will be black, and if the individual is homozygous for the recessive trait for the allele of the color distribution, then the rabbits will be gray.
RR w SsGg (9black) x m ssgg (white)
Consider the possible combinations of genes in the offspring.
m / f sg ssgg (black) sg ssgg (gray) sg ssGg (white) ssgg (white)
25% are black rabbits;
25% are gray rabbits;
50% are white rabbits.
Answer: when crossing a black diheterozygous female with a white homozygous male, the ratio of phenotypes in the offspring is 1: 1: 2.
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