A heterozygous mouse is having alleles for both black fur and white fur (Bb) the mouse has black fur being the dominant allele, B is always expressed.
What is allele?
In a given genomic location, an allele is one of two or more versions of a DNA sequence .
For any given genomic location where such variation exists, an individual inherits two alleles, one from each parent. If the two alleles are identical, the person is homozygous for that allele.
A dominant/recessive relationship is the basically common interaction between alleles.
When one allele of a gene effectively take over the other (recessive) allele, the allele is said to be dominant. Dominant - recessive gene relationships can be seen for instance in eye color and blood groups.
Thus, A heterozygous mouse has sets of genes for both black fur and white fur (Bb) because the dominant allele, B, is always expressed.
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