In Mice, Black Coat Color Is Dominant to White Coat

Multiple Choice

In mice, black coat color is dominant to white coat color. In the pedigree below, mice with a black coat are represented by darkened symbols, and those with white coats are shown as open symbols. What is the genotype of III- 1?

A) heterozygous or homozygous recessive
B) heterozygous
C) homozygous recessive
D) homozygous dominant
E) homozygous dominant or heterozygous