MONOZYGOTIC AND DIZYGOTIC TWIN DIAGNOSIS

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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.

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