NEET BIOLOGY

Detailed explanation-1: -Thus, the genotypic as well as the phenotypic ratio of the offsprings is 1:1 which implies that out of the two offsprings one will be blue-eyed and another one will be brown-eyed. blue-eyed, the phenotype of offsprings came out to be1:1 .

Detailed explanation-2: -If these two have a child, there would be a 0% chance of the offspring have blue eyes. The only genotype that this couple could produce is “Bb” which is heterozygous and would express brown eyes only.

Detailed explanation-3: -Brown eye colour is dominant over blue eye colour. Therefore, for the brown-eyed parents having blue-eyed child, the possibility is that both have heterozygous genotype i.e. Bb. Therefore, from the square below, it is clear that there is a 25% possibility of blue-eyed (bb) child.

Detailed explanation-4: -Both parents with blue eyes: 99% chance of baby with blue eyes, 1% chance of baby with green eyes, 0% chance of baby with brown eyes. Both parents with green eyes: 75% chance of baby with green eyes, 25% of baby with blue eyes, 0% chance of baby with brown eyes.