Question

the dominant allele is for black fur. the recessive allele is for white fur. a mouse that is homozygous for the dominant trait has the genotype bb. it has black fur. a mouse that is homozygous for the recessive trait has the genotype bb. it has white fur. complete a mouse has alleles for both black fur and white fur ( ). the mouse has because the dominant allele, b, is always expressed. done

Explanation:

Step1: Recall genetic - term definitions

A heterozygous organism has two different alleles for a trait. Here, the alleles for fur color are B (dominant for black) and b (recessive for white). So a heterozygous mouse has the genotype Bb.

Step2: Determine fur - color based on dominance

Since the dominant allele B is for black fur and the dominant allele is always expressed in a heterozygous individual, the heterozygous mouse has black fur.

Answer:

A heterozygous mouse has alleles for both black fur and white fur (Bb). The mouse has black fur because the dominant allele, B, is always expressed.