Question

if brown eyes are dominant over blue eyes, what would be the parent genotypes if two heterozygous brown - eyed persons were crossed?

Explanation:

Step1: Define allele symbols

Let B represent the dominant allele for brown - eyes and b represent the recessive allele for blue - eyes.

Step2: Determine heterozygous genotype

A heterozygous individual has one dominant and one recessive allele. So, a heterozygous brown - eyed person has the genotype Bb.

Step3: Identify parent genotypes

Since both parents are heterozygous brown - eyed, their genotypes are Bb and Bb.

Answer:

Bb and Bb