The term genotype refers to expression of two alleles in the same locus of two nonsister chromosome. Which denoted as BB,Bb, bb.
The term heterozygote refers to expression of two different allele. That is Bb.
The term homozygote refers to expression of two same allele. Which are either dominant( express in phenotype both in homozygote or heterozygote condition, that is B-black fur) or recessive(express in phenotype only in homozygote condition, that is b-white fur).
