Question

Two brown eyed parents give birth to a blue eye baby. Which trait (blue eyed or brown eyed) is dominant

Answer 1

Answer:

The brown eyed trait is dominant

Explanation:

This question involves a single gene coding for eye color in humans. The alleles responsible for these traits in the gene are brown alleles (B) and blue allele (b). However, according to this question, two brown eyed parents give birth to a blue eye baby.

The dominant trait is the BROWN-EYES, however, the two brown-eyed parent gave birth to a blue eyed child because the two parents were heterozygous for the trait i.e. contained one brown allele and one blue allele in their respective gene (Bb). Hence, if these two cross, 3/4 of the children will possess the dominant trait (brown eyes) while 1/4 will possess the recessive trait (blue eyes).