An example of codominance is seen in the roan coat in horses. A roan coat consists of both black and white hairs. Thus the coat appears blue colored rather than black or white purebred black (BB) blue roan (BW) purebred white (WW) PROBLEMS а
1. What happens when you cross a black horse and a blue roan horse? genotype ratio: phenotype ratio
2. What happens when you cross two blue roan horses? genotype ratio: phenotype ratio:
1. What happens when you cross a black horse and a blue roan horse? genotype ratio: phenotype ratio
2. What happens when you cross two blue roan horses? genotype ratio: phenotype ratio:
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Answer:
1. If you will cross a pure black horse with a roan horse, it will produce 2 pure black horses and 2 roan coat horses.
Genotype : Phenotype
2 BB (black)
2 BW (roan)
Genotypic Ratio Phenotypic Ratio
2:2 2:2
2. If you cross 2 blue roan horse, the cross will produce 1 pure black horse, 2blue roan horses and 1 purewhite horse.
Genotype : Phenotype
1 BB (black)
2 BW (roan)
1 WW (white)
Genotypic Ratio Phenotypic Ratio
1:2:1 1:2:1