Single Gene Inheritance Patterns : Incomplete Dom 4 certain species of hamsters , fur color is inherited by alleles that show incomplete dominance , Brown fur ( B) incompletely dominant to white fur (b ). Heterozygotes ( Bb) will grow a tan colored fur a Punnett square showing a cross between a homozygous brown fur and a homozygous white fur . What are the genotypes of the offspring? What are their phenotypes ?