MONOZYGOTIC AND DIZYGOTIC TWIN DIAGNOSIS

Abstract

Summary A method of estimating the probability of dizygotic and monozygotic twin pairs is described. Parent‐child and sib‐sib frequency tables for the ABO, MNS and Rhesus blood‐group systems and formulae for obtaining these tables for the P , Lutheran, Kell, Duffy, Kidd and non‐secretor (or Lewis) systems are given. Tables of the distribution of differences in total finger ridge count and atd palmar angles are also given. The probability that a given twin pair is monozygotic is estimated in two worked examples.