A – brown eyes, a – blue, B – right-handedness, b – left-handedness. Brown-eyed right-hander, married to a blue-eyed

A – brown eyes, a – blue, B – right-handedness, b – left-handedness. Brown-eyed right-hander, married to a blue-eyed left-hander, what offspring should be expected from marriage?

The blue-eyed left-hander will be written, according to the designations introduced in the problem statement, as aavb, because for the phenotypic realization of both traits belonging to the recessive category, the genotype must be homozygous for the genes of these traits. The woman will produce the same type of eggs – ab.

A brown-eyed right-hander can be either homozygous for dominant trait genes or heterozygous for them. Accordingly, we will write down 2 options for solving the problem.

Let the brown-eyed right-hander be digomozygous – AABB. It produces the same type of spermatozoa AB. All offspring in a braga with a blue-eyed left-hander will be represented by diheterozygotes AaBb – children who predominantly own the right hand and have brown eyes;

Let the brown-eyed right-hander be diheterozygous – AaBb. It will produce four types of sperm – ab, AB, Ab, aB. In a marriage with a blue-eyed left-handed person, the possible offspring will be represented by the following options:

left-handed children with blue eyes (aabb) – 25%;

right-handed children with brown eyes (AaBb) – 25%;

left-handed children with brown eyes (Aabb) – 25%;

right-handed children with blue eyes (aaBb) – 25%.