Palomino (golden brown) horses are bred for their coat coloration. A breeder will achieve 100% Palomino offspring by crossing a chestnut (dark brown) horse with a cremello (cream) horse. However, if a breeder crosses two Palomino horses, only 50% of the offspring will be Palomino, while 25% will be chestnut and 25% will be cremello. Genetic inheritance of coat color in these horses is best described as:A.codominance.B.complete dominance.C.variable expressivity.D.incomplete dominance.
Question
Palomino (golden brown) horses are bred for their coat coloration. A breeder will achieve 100% Palomino offspring by crossing a chestnut (dark brown) horse with a cremello (cream) horse. However, if a breeder crosses two Palomino horses, only 50% of the offspring will be Palomino, while 25% will be chestnut and 25% will be cremello. Genetic inheritance of coat color in these horses is best described as:A.codominance.B.complete dominance.C.variable expressivity.D.incomplete dominance.
Solution
The genetic inheritance of coat color in these horses is best described as D. Incomplete dominance.
Here's why:
Incomplete dominance is a form of intermediate inheritance in which one allele for a specific trait is not completely expressed over its paired allele. This results in a third phenotype in which the expressed physical trait is a combination of the phenotypes of both alleles.
In the case of the Palomino horses, neither the chestnut nor the cremello color is completely dominant. When a chestnut horse is crossed with a cremello horse, the result is a Palomino horse, which is a blend of the two colors.
However, when two Palomino horses are crossed, the offspring can be Palomino, chestnut, or cremello. This shows that the chestnut and cremello traits are not completely masked by the Palomino trait, which is a characteristic of incomplete dominance.
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