In the United States of America? What ethnic groups is it most common in? My mom has A- and my dad has O+ is this possible? And is left handedness genetic?
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Yes, an A- mom and an O+ dad could certainly produce an O negative child. O negative is not very common. It occurs in approximately 7% of the American population. It is most commonly found in Caucasians, and less so in Blacks, and very rarely in Asians.