The relation between total finger ridge-count and variability of counts from finger to finger: genetic implications of racial variation

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Abstract
The measure of ridge-count diversity, S/.sqroot.10, was computed for a sample of American whites, American blacks and African blacks and the regression of S/.sqroot.10 on total ridge-count was determined for each group. The shapes of the regression lines differed considerably. The American white curve was very similar to an English sample, while the 2 Negro curves generally showed lower S/.sqroot.10 values for ridge-counts over 80. The American Negro curve behaved like a mixture of the white and African Negro curve to a degree approximating to the fraction of white genes in their gene pool. Parent-child data construct a simple test of the hypothesis that S/.sqroot.10 reflects zygosity in total ridge-count genotypes.
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