A left-handed man whose parents were right-handed married a right-handed woman whose father was left-handed
A left-handed man whose parents were right-handed married a right-handed woman whose father was left-handed and whose mother was right-handed. What kind of children can you expect from this marriage?
Since the man is left-handed, and his parents are right-handed, the genotype of the parents is heterozygous for the given trait. Male father genotype: XYAa × XXAa
Gametes: XA Xa YA Ya XA Xa
Intended children: XXAA right-handed daughter, XXAa right-handed daughter, XYAA right-handed son, XYAa right-handed son, XXAa right-handed daughter, XXaa left-handed daughter, XYAa right-handed son, XYaa left-handed son.
Left-handed woman’s father: XYaa × XXAA (right-handed woman’s mother)
Gametes: Xa Ya XA
Intended children: XXAa right-handed daughter, XYAa right-handed son.
So the male is left-handed XYaa × XXAa (and the female is right-handed)
Gametes: Xa Ya XA Xa
Intended children: XXAa right-handed daughter, XYAa right-handed son, XXaa left-handed daughter, XYaa left-handed son.