In humans, brown eye color dominates over blue, and the ability to wield the right hand better over the ability

In humans, brown eye color dominates over blue, and the ability to wield the right hand better over the ability to wield the left. a brown-eyed left-hander marries a blue-eyed right-hander. they had a child, a blue-eyed left-hander. Determine the genotype of the parents

Let the gene responsible for the formation of brown eyes be B, then the gene responsible for the development of the blue iris will be b.

Let the left-hemispheric lateralization, which determines the person’s better control of the right hand, be C, then gene c will be responsible for the right-hemispheric lateralization, which determines the better control of the person with the left hand.

A left-handed child with blue eyes will be bbcc, because only in conditions of homozygosity is the possible phenotypic realization of the traits in question.

This means that from each of the parents he inherits only the genes for blue-eyed and left-handedness. Consequently, parents with dominant traits for them are heterozygous.

The brown-eyed left-handed father will be Bbcc, and the blue-eyed right-handed mother will be bbCc.