The brown-eyed right-hander married a blue-eyed left-hander. They gave birth to a blue-eyed southpaw. Determine the mother’s genotype (brown eyes and right-handedness dominate).
1) Since their child showed recessive genes for both signs, he received one of them from each parent, i.e.
2) mom was heterozygous in two ways,
3) its genotype: AaBb.
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