In humans, brown eye color and the ability of a right-handed person are inherited as dominant traits.

In humans, brown eye color and the ability of a right-handed person are inherited as dominant traits. A brown-eyed right-handed man who is homozygous for both traits marries a blue-eyed left-hander, determine the phenotypes of children.

Let the gene that determines the brown eye color of a person be K, and the gene that determines his blue eye color be k.

Let the ability to predominantly own the right hand be determined by the gene designated as R, and the predominant possession of the left hand by the gene r.

The young man is right-handed with brown eyes, according to the condition, is homozygous for both signs. Let’s write it down KkRr. The body of such a young man will produce four types of sperm – kr, KR, kR, Kr.

A left-handed girl with blue eyes will necessarily be homozygous for both pairs of genes, because the traits that appear in her phenotype (blue eyes and left-handedness) are recessive. Let’s write it down kkrr, and the eggs of the same type produced by it – kr.

All possible offspring of this married couple will be represented by the following options:

left-handed children with blue eyes (kkrr);

right-handed children with brown eyes (KkRr);

right-handed children with blue eyes (kkRr);

left-handed children with brown eyes (Kkrr).