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Abstract. The Duffy blood group phenotypes of 554 random, unrelated, Caucasian families and 1,492 of their children are reported. The gene frequencies calculated from the parental phenotypes are Fy x 0.424, Fy b 0.560, Fy x 0.015 and Fy 0.001. A second example of phenotype Fy x (almost certainly Fy x Fy x ) is included.
Lewis et al. (Fri,) studied this question.