AP BIOLOGY

Detailed explanation-1: -Black is dominant, which means black individuals must have at least one B allele. Their genotype could be either BB or Bb.

Detailed explanation-2: -An organism with two dominant alleles for a trait is said to have a homozygous dominant genotype. Using the eye color example, this genotype is written BB. An organism with one dominant allele and one recessive allele is said to have a heterozygous genotype. In our example, this genotype is written Bb.

Detailed explanation-3: -Black coloured animals will have phenotype BB. Recessive genotype is bb which will express brown colour. The pure breeding of different coloured animals will occur on breeding homozygous dominant with homozygous recessive.

Detailed explanation-4: -We the black furred dog has to be genotype aa because he displays the recessive phenotype. The offspring produced from this cross would be 2 Aa and 2 aa genotypes, based on a punnet square.