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In chickens, gene A encodes Protein A, which is required to produce brown pigment in the
feathers. Gene B encodes Protein B, which blocks this brown pigment from being deposited in the
feathers. The recessive allele of both of these genes do not produce the corresponding proteins.
a. In this interaction, which gene is epistatic, and which gene is hypostatic? How can you tell? ( 2
points) b. Write the possible genotypes for a chicken with white feathers, and for a chicken with
brown feathers. ( 3 points) c. Would it be possible to produce a white-feathered chicken from
crossing two brown-feathered chickens? ( 2 points) If so, write the genotype of the two brown-
feathered chickens and their white-feathered offspring ( 2 points) d. Write the phenotypic ratio
expected in a cross of two doubly heterozygous chickens. (1 points)

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In chickens gene A encodes Protein A which is required to .pdf

  • 1. In chickens, gene A encodes Protein A, which is required to produce brown pigment in the feathers. Gene B encodes Protein B, which blocks this brown pigment from being deposited in the feathers. The recessive allele of both of these genes do not produce the corresponding proteins. a. In this interaction, which gene is epistatic, and which gene is hypostatic? How can you tell? ( 2 points) b. Write the possible genotypes for a chicken with white feathers, and for a chicken with brown feathers. ( 3 points) c. Would it be possible to produce a white-feathered chicken from crossing two brown-feathered chickens? ( 2 points) If so, write the genotype of the two brown- feathered chickens and their white-feathered offspring ( 2 points) d. Write the phenotypic ratio expected in a cross of two doubly heterozygous chickens. (1 points)