In humans, the brown-eyed gene dominates over the blue-eyed gene, and right-handedness over left-handedness.

In humans, the brown-eyed gene dominates over the blue-eyed gene, and right-handedness over left-handedness. What kind of children can be if the mother is blue-eyed left-handed, and the father is heterozygous in eye color and in the ability to use the right hand.

Let’s designate the gene that leads to the development of a brown iris in humans as K, and the blue iris gene as k.

Let’s designate the gene for right-handedness as S, and the gene for left-handedness as s.

A blue-eyed left-handed female mother will be kkss, because homozygosity is a condition for the realization of these traits. It produces eggs of the same type – ks.

The father is heterozygous for eye color and right-handedness – KkSs. The sperm produced by it look like this: ks, KS, kS, Ks.

Children expected by a given married couple can be represented by the following options:

25% – kkss: left-handed blue-eyed;

25% – KkSs: right-handed brown-eyed;

25% – kkSs: right-handed blue-eyed;

25% – Kkss: left-handed brown-eyed.