In dogs, Gene B specifies a protein required for eumelanin (dark pigment) deposition. Protein B (specified by the B allele) deposits eumelanin densely so that the dog’s hair is black. Protein b (specified by the b allele) deposits eumelanin less densely, producing brown hair (chocolate). Allele B is dominant to allele b. Gene D specifies another protein that is also required for pigment deposition. The recessive allele d1specifies a protein that functions less efficiently than that specified by the dominant allele D. Less pigment is deposited in d1d1homozygous dogs than in dogs with a D allele, and so the color dictated by gene B is lighter.    1. Which of the following genotypes would a light-chocolate dog have? A) Bb d1d1  B) BB d1d1  C) bb d1d1  D) bb Dd1

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In dogs, Gene B specifies a protein required for eumelanin (dark pigment) deposition. Protein B (specified by the B allele) deposits eumelanin densely so that the dog’s hair is black. Protein b (specified by the b allele) deposits eumelanin less densely, producing brown hair (chocolate). Allele B is dominant to allele b. Gene D specifies another protein that is also required for pigment deposition. The recessive allele d1specifies a protein that functions less efficiently than that specified by the dominant allele D. Less pigment is deposited in d1d1homozygous dogs than in dogs with a D allele, and so the color dictated by gene B is lighter. 

 

1. Which of the following genotypes would a light-chocolate dog have?

A) Bb d1d1 

B) BB d1d1 

C) bb d1d1 

D) bb Dd1

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