PATHOLOGY

Detailed explanation-1: -In cocker spaniels the allele for a black coat color (B) is dominant over the allele for a brown coat color (b). If a brown cocker spaniel (bb) is crossed with a heterozygous black cocker spaniel (Bb), how many of the offspring may be brown (bb)? All offspring will have short-haired fur.

Detailed explanation-2: -In cocker spaniels, black coat color (B) is dominant over red (b), and solid color (S) is dominant over spotted (s).

Detailed explanation-3: -Dogs with B/b genotype are expected to express undiluted black pigment and are carriers of brown. They will transmit the brown allele to 50% of their offspring.

Detailed explanation-4: -Finally, the genotype of an organism with two recessive alleles is called homozygous recessive. In the eye color example, this genotype is written bb.

Detailed explanation-5: -Normal fruit flies have brownish-yellow bodies, and this body color is dominant. A mutation in the gene for body color can produce flies with an ebony body color. A homozygous normal fruit fly (e+e+) is crossed with a homozygous ebony fruit fly (ee).