Tennessee Walking Horses and Clydesdales are breeds of horses that have the sabino white spotting color...
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Tennessee Walking Horses and Clydesdales are breeds of horses that have the sabino white spotting color pattern; however, the gene for sabino in Tennessee Walkers is on a different locus from that for Clydesdales. Each breed is homozygous recessive for the other breed's sabino gene. In the Tennessee Walker, sabino is incompletely dominant where the heterozygote is sabino and the homozygous dominant individuals are completely white; the homozygote is epistatic to all other loci. In Clydesdales, all individuals are homozygous for their breed's dominant sabino allele. a. (2pts) Therefore, if SBI represents the dominant allele for sabino in Tennessee Walkers and B the dominant allele for sabino in Clydesdales, what is the genotype of each breed if they are sabino? Assume the cross between sabino individuals from these breeds and a subsequent inter se mating of the F₁s (dihybrids). What is the probability of the following in the progeny of the F₁ matings? Show work for how you arrived at your answer. b. (2pts) A sabino foal c. (2pts) A sabino foal given it is homozygous recessive for the allele causing sabino in Tennessee Walkers. d. (2pts) A twin set where the first is solid and the second is sabino 50 Tennessee Walking Horses and Clydesdales are breeds of horses that have the sabino white spotting color pattern; however, the gene for sabino in Tennessee Walkers is on a different locus from that for Clydesdales. Each breed is homozygous recessive for the other breed's sabino gene. In the Tennessee Walker, sabino is incompletely dominant where the heterozygote is sabino and the homozygous dominant individuals are completely white; the homozygote is epistatic to all other loci. In Clydesdales, all individuals are homozygous for their breed's dominant sabino allele. a. (2pts) Therefore, if SBI represents the dominant allele for sabino in Tennessee Walkers and B the dominant allele for sabino in Clydesdales, what is the genotype of each breed if they are sabino? Assume the cross between sabino individuals from these breeds and a subsequent inter se mating of the F₁s (dihybrids). What is the probability of the following in the progeny of the F₁ matings? Show work for how you arrived at your answer. b. (2pts) A sabino foal c. (2pts) A sabino foal given it is homozygous recessive for the allele causing sabino in Tennessee Walkers. d. (2pts) A twin set where the first is solid and the second is sabino 50
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