NEET BIOLOGY

Detailed explanation-1: -If B is the allele for brown eyes and b is blue, the genotype of the blue-eyed man is bb.

Detailed explanation-2: -(c) Man is brown eyed, will have genotype Bb. The woman is blue-eyed will have genotypes bb. Thus the possible genotypes of their offsprings will be: Bb and bb.

Detailed explanation-3: -Eye color was traditionally described as a single gene trait, with brown eyes being dominant over blue eyes. Today, scientists have discovered that at least eight genes influence the final color of eyes.

Detailed explanation-4: -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-5: -The female therefore has a genotype bb (homozygous recessive). Since one eye color allele is inherited from the mother and the other from the father, the offspring will have one eye color allele from each parent. Since one child has blue eyes, they will have a genotype bb (homozygous recessive).