In chickens, the striped color of the plumage is determined by the dominant sex-linked gene B, black – b; dark skin color

In chickens, the striped color of the plumage is determined by the dominant sex-linked gene B, black – b; dark skin color – autosomal gene S, white – s; rose-shaped crest – R, leaf-shaped – r. The autosomal gene C in the heterozygous state (Cc) causes short-leggedness, and in the homozygous (CC) it has a lethal effect; the recessive homozygote (cc) has normal leg length.
1) Black, dark-skinned rooster with a leaf-shaped comb; striped white-skinned chicken with a leaf-shaped crest. What kind of chicks can you expect from such a cross?
2) A black, dark-skinned rooster with a pink comb is crossed with a striped dark-skinned chicken with a leaf-shaped comb. Among the chickens there are 6 striped dark-skinned cockerels, 2 striped white-skinned cockerels, 5 black dark-skinned hens and 2 black white-skinned hens. All chicks have a pink comb. Determine the genotypes of the parents.
3) A striped white rooster with a leaf-shaped comb and a black, dark-skinned hen with a pink-shaped comb produced 18 chickens – all striped dark-skinned with a pink-shaped comb. Determine the genotypes of the parents.
4) A short-legged striped rooster is crossed with a short-legged black hen. What are the descendants of F1 and F2?
5) A short-legged rooster heterozygous for striped plumage is crossed with a short-legged black chicken. What offspring can be expected from such a cross?
6) Chickens were obtained from unknown hens and roosters: 1/6 with normal legs of black females, 1/6 with normal legs of striped males, 1/3 of short-legged black females and 1/3 of short-legged striped males. Identify the genotypes and phenotypes of the parents.

1) a) If the male genotype is rrSSX X, then in the offspring the chickens are striped dark-skinned with a leaf-shaped crest and black dark-skinned with a leaf-shaped crest in a ratio of 1: 1;
b) if the male genotype is rrSsXb Xb, then in the offspring of the chickens are striped dark-skinned with a leaf-shaped crest, striped white-skinned with a leaf-shaped crest, black dark-skinned with a leaf-shaped crest and black white-skinned with a leaf-shaped crest in a ratio of 1: 1: 1: 1;
2) genotypes (women) rrssXBY, (husband) RRSsXBXB;
3) genotypes (women) RRSSXbY, (husband) rrssXBXB;
4) a) if the male genotype is CcX X, then in the offspring there are 1/3 striped short-legged females, 1/6 striped females with normal legs, 1/3 striped short-legged males and 1/6 striped males with normal legs;
b) if the genotype of the male is CcXvX, then in the offspring there are 1/6 striped short-legged females, 1/6 black short-legged females, 1/12 striped females with normal legs, 1/12 black females with normal legs, 1/6 striped short-legged males, l / 6 black short-legged cockerels, 1/12 striped cockerels with normal legs, 1/12 black cockerels with normal legs;
5) striped short-legged hens, black short-legged hens, striped hens with normal legs, black hens with normal legs, striped short-legged cockerels, black short-legged cockerels, striped cockerels with normal legs, black cockerels with normal legs in a ratio of 1: 1: 1: 1 : 1: 1: 1: 1;
6) genotypes (women) ccX Y (striped short-legged), (man) CcX X (black short-legged).

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