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Effects of genetic and environmental factors on the a-b, b-c and c-d interdigital ridge counts
M I Arrieta1, B Criado, R Hauspie
1Dpto Biología Animal y Genética, Facultad de Ciencias, Universidad del Pais Vasco, Bilbao, Spain.
Abstract:
A study of 100 MZ (55 female and 45 male) and 97 DZ (50 male and 47 female) same-sexed twin pairs was carried out to analyse the genetic component of the variance of the a-b, b-c and c-d interdigital ridge counts by means of the Christian method. Especially for the a-b interdigital ridge count, we found it important to analyse both sexes separately. Our results suggest that the a-b count in males seems to be more influenced by environmental factors than the other counts. For females, the three interdigital counts seem to have a strong genetic component influencing their phenotypic expression. Factor analysis with VARIMAX rotation showed each interdigital ridge count to be genetically independent.