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Quantitative Twin Analysis of Radial and Ulnar Ridge Counts and Ridge Count Diversity

Published online by Cambridge University Press:  01 August 2014

Terry Reed*
Affiliation:
Department of Medical Genetics, Indiana University School of Medicine, Indianapolis
Joe C. Christian
Affiliation:
Department of Medical Genetics, Indiana University School of Medicine, Indianapolis
*
Department of Medical Genetics, Indiana University, 1100 W. Michigan St., Indianapolis, IN 46223

Abstract

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Analysis of variance was performed on the radial and ulnar finger ridge counts and ridge count diversity index in 360 twin sets from which estimates of genetic variance were obtained. Findings for radial and ulnar counts paralleled those previously obtained for finger pattern type and ridge count (larger of radial and ulnar count). In contrast, ridge count diversity showed no indication of unequal total variances, as previously found for the total ridge count. One must be cautious not to exclude genetic influences on traits, such as the thumb variables in this study, where there are unequal total variances between monozygotic and dizygotic twins and the more conservative estimate of genetic variance is not significant.

Type
Brief-Report
Copyright
Copyright © The International Society for Twin Studies 1979

References

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