NEET BIOLOGY

Detailed explanation-1: -For mice black (B) is dominant phenotype and white (b) is recessive. In certain experiment, a black male mouse of genotype Bb is crossed with a white female of genotype bb. Show with the help of a chart that, when baby are produced, the ratio of black and white will be 1:1.

Detailed explanation-2: -Thus the mating of two heterozygous black mice produces the expected ratio of 3 black : 1 brown offspring.

Detailed explanation-3: -The dominant color in mice from black and white is black. The recessive gene in the black mice is in codominant and incomplete dominance with the white allele. However, the black mice have different recessive genes.

Detailed explanation-4: -Hence, phenotypic ratio is 3 black: 1 brown i.e. 75% of the progeny would have black coat.