The DNA of a mouse is analyzed to reveal the presence of alleles resulting in brown fur color. The mouse is heterozygous, Bb,

Question

The DNA of a mouse is analyzed to reveal the presence of alleles resulting in brown fur color. The mouse is heterozygous, Bb, yet is completely colorless in phenotype. This can be explained as an occurrence of 
(A) epigenesis. 
(B) epistasis. 
(C) incomplete dominance. 
(D) pleiotropy. 
(E) codominance.

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