LIFE SCIENCE

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 a population of mice, fur color is determined by one gene with a dominant and a recessive allele. Black mice are homozygous dominant, brown mice are heterozygous and white mice are homozygous recessive.

Detailed explanation-3: -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.

Detailed explanation-4: -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.