AP BIOLOGY

Detailed explanation-1: -Answer: The phenotypic ratio of the progeny will be 2 Black: 2 White, i.e. option (c) is the correct answer.

Detailed explanation-2: -In mice, black fur (B) is dominant to brown fur (b) and a short tail (T) is dominant to a long tail (t). Two mice with the genotype BbTt have two separate litters of offspring together.

Detailed explanation-3: -Complete answer: The probability that a white mouse that is homozygous for long fur and a mouse heterozygous for both traits can have an offspring with short white fur is 0. Let us understand this by analysing the genes responsible for the traits and how they are inherited by the progeny.

Detailed explanation-4: -Brown fur (B) in mice is dominant over white fur (bb). You have two brown mice, and when they are bred together you obtain 3 brown-haired offspring and one white-haired offspring.

Detailed explanation-5: -1 Mice can have black hair or brown hair in their fur. The allele for black hair (B) is dominant to the allele for brown hair (b). A homozygous black haired mouse mated with a homozygous brown haired mouse to produce the first generation of offspring.