PATHOLOGY

Detailed explanation-1: -In guinea pigs, the allele for black coat color (B) is dominant over the allele for white coat color (b). In an ideal mouse population exhibiting Hardy-Weinberg equilibrium of 31 guinea pigs, 2 are homozygous dominant, 11 are heterozygous, and 18 are homozygous recessive.

Detailed explanation-2: -In Guinea pigs, the genotype (BB) is black, and the genotype (bb) is white color, and (Bb) is grey color, The gene (B) and (b) are sex-linked.

Detailed explanation-3: -Students distinguish dominant and recessive genes as evidenced by the long-hair (dominant) and short-hair (recessive) traits in this species of guinea pigs. As a variation, students could use a Punnett square to identify how other traits are passed along through generations.

Detailed explanation-4: -(b) In guinea pigs the genes for hair colour and length are located on non-homologous chromosomes. The allele for black (B) is dominant to the allele for brown (b) and the allele for short hair (S) is dominant to the allele for long hair (s).