In humans, brown eye color and the ability to better control the right hand are inherited as dominant traits.

In humans, brown eye color and the ability to better control the right hand are inherited as dominant traits. A brown-eyed young man who has better control of his right hand, homozygous for both characteristics, marries a blue-eyed left-hander. Determine: 1) what kind of offspring can be expected from this marriage; 2) what phenotype can grandchildren have from a marriage of a son with a woman who has the characteristics of his mother, and a daughter with a man who has the characteristics of her father.

Let’s designate the dominant and recessive alleles of the genes: A – brown eye color, a – blue color, B – right-handedness, b – left-handedness.
1) Offspring from marriage – brown-eyed right-handers;
2) a) grandchildren from a son – brown-eyed right-handers, brown-eyed left-handers, blue-eyed right-handers, blue-eyed left-handers in a ratio of 1: 1: 1: 1;
b) grandchildren from a daughter – brown-eyed right-handers.