In a certain dog breed the allele B and the allele b for a spotted coat is recessive. What genotypes for this dog breed would lead to a spotted phenotype

1 answer

In this dog breed, the allele for a spotted coat (b) is recessive, meaning that an individual must have two copies of the recessive allele to express the spotted phenotype. Therefore, the genotypes that would lead to a spotted phenotype are:

  1. bb: homozygous recessive (having two recessive alleles).

Dogs with this genotype will exhibit the spotted coat phenotype.

Dogs with the following genotype will not have a spotted coat, as they will possess at least one dominant allele (B):

  1. BB: homozygous dominant (having two dominant alleles).
  2. Bb: heterozygous (having one dominant allele and one recessive allele).

In summary, the only genotype that results in the spotted phenotype is bb.