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Diagnosis of twin zygosity by dermatoglyphic index

Gloria M.D.D. Colletto; Mirna Kolya; Santa Zimberknopf

Departamento de Biologia, Instituto de Biociências, Universidade de São Paulo, Caixa Postal 11461, 05421 São Paulo, SP, Brasil. Send correspondence to G.M.D.D.C. at the following address: Instituto de Ciências Biomédicas, Universidade de São Paulo, Caixa Postal 4365, 05508 São Paulo, SP, Brasil

ABSTRACT

A sample of 120 twin pairs were analyzed for 35 dermatoglyphic variables (palmar and digital). The zygosity was determined through seven genetic markers (ABO, MNSs, Rh, Duffy, P, Kell, and serum haptoglobins) and a similarity questionnaire. A discriminant analysis was performed on the within-pair difference of the dermatoglyphic variables, and fifteen of these variables were selected in a function by the stepwise method. This function permitted classifying 100% of the twin pairs studied in a correct zygosity, showing the effectiveness of this methodology.

Keywords: twin; zygosity; dermatoglyphic.

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