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Genetic and Environmental Variation of Ridge-Counts on Fingers, Palms, Soles and Toes: A Twin Study
Published online by Cambridge University Press: 01 August 2014
Abstract
A multivariate procedure for estimating heritable components from twin data was applied to ridge counts obtained from the entire dermatoglyphic system. Covariance matrices of MZ and DZ within-pair differences were used to estimate genetic correlation matrices for 20 finger ridge counts, 6 palmar interdigital counts, 20 toe counts, 4 hallucal counts, and 6 sole interdigital counts. The proportion of genetic variation was found to be greater in ridge counts of patterns than in ridge counts of interdigital areas. On digits, finger counts are more highly heritable than toe counts. Each of the dermatoglyphic areas yielded several independent genetic components, ranging from general to specific. Environmental variation was found to be local and to frequently involve reciprocal interaction between twin pairs.
- Type
- Research Article
- Information
- Acta geneticae medicae et gemellologiae: twin research , Volume 33 , Issue 4 , October 1984 , pp. 531 - 546
- Copyright
- Copyright © The International Society for Twin Studies 1990
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