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. it has.
a mouse that is h gous for the recessive trait has the genotype bb. it has.
done
bb
bb
bb

Explanation:

Step1: Recall Genotype Rules

Homozygous dominant means two dominant alleles. Given dominant allele for black is \( B \), so genotype is \( BB \). Phenotype: dominant trait (black fur) shows.

Step2: Recall Recessive Genotype

Homozygous recessive means two recessive alleles (\( b \)), so genotype \( bb \). Phenotype: recessive trait (white fur) shows.

Answer:

• Homozygous dominant mouse: Genotype \( BB \), Phenotype black fur.
• Homozygous recessive mouse: Genotype \( bb \), Phenotype white fur.