Part D Predict the F? result of many initial matings between cremello and chestnut horses. 1/2 chestnut 1/2 palomino 1/4 chestnut 1/2 palomino 1/4 cremello 1/2 chestnut 1/2 cremello 1/8 chestnut 6/8 palomino 1/8 cremello
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Step 1: The F1 generation will be all heterozygotes, with one copy of the chestnut allele and one copy of the cremello allele. Show more…
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Horses can be cremello (a light cream color), chestnut (a brownish color), or palomino (a golden color with white in the horse's tail and mane). Of these phenotypes, only palominos are never true breeding. Consider the results of the following crosses: cremello x palomino = ½ cremello, ½ palomino chestnut x palomino = ½ chestnut, ½ palomino palomino x palomino = ¼ chestnut, ½ palomino, ¼ cremello What should we expect if we cross a cremello horse with a chestnut horse? ½ cremello, ½ palomino ½ chestnut, ½ palomino ¼ chestnut, ½ palomino, ¼ cremello all chestnuts all palominos
Jakob W.
Horses can be cremello (a light cream color), chestnut (a reddish brown color), or palomino (a golden color with white in the horse's tail and mane). Of these phenotypes, only palominos never breed true. The following results have been observed: cremello $\times$ palomino $\longrightarrow 1 / 2$ cremello $1 / 2$ palomino chestnut $\times$ palomino $\longrightarrow 1 / 2$ chestnut $1 / 2$ palomino palomino $\times$ palomino $\longrightarrow 1 / 4$ chestnut $1 / 2$ palomino $1 / 4$ cremello (a) From these results, determine the mode of inheritance by assigning sene symbols and indicating which genotypes yield which phenotypes. (b) Predict the $\mathrm{F}_{1}$ and $\mathrm{F}_{2}$ results of many initial matings between cremello and chestnut horses.
Suman K.
The basic body color of horses is influenced by several genes, one of which has several different alleles. Two of these alleles—the chestnut (dark brown) allele and a diluting (pale cream) allele display incomplete dominance. A horse heterozygous for these two alleles is a palomino (golden body color with flaxen mane and tail). Consider the crosses below and determine the proportion (%) of offspring that are likely to be Chestnut: In a cross between a palomino female and palomino male, you would expect [ Select ] ["0", "25", "100", "50"] % of the offspring to be chestnut. In a cross between a pale cream female and chestnut male, you would expect [ Select ] ["25", "100", "50", "0"] % of offspring to be chestnut.
Jenny W.
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