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ridge count

Acta geneticae medicae et gemellologiae: twin research (1)

International Soc for Twin Studies (1)

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Quantitative Twin Analysis of Radial and Ulnar Ridge Counts and Ridge Count Diversity
Terry Reed, Joe C. Christian
Journal:

Acta geneticae medicae et gemellologiae: twin research / Volume 28 / Issue 2 / April 1979

Published online by Cambridge University Press:

01 August 2014, pp. 165-168

Print publication:

April 1979
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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.