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  • Title: The monozygotic twinning rate: is it really constant?
    Author: Allen G, Hrubec Z.
    Journal: Acta Genet Med Gemellol (Roma); 1987; 36(3):389-96. PubMed ID: 3451647.
    Abstract:
    Weinberg's difference method, applied to twin birth statistics, usually shows a dependence of the MZ rate on maternal age, like a thin shadow of the DZ rate. Some of this MZ variation could be explained away by James' finding of more same-sex (SS) than opposite-sex (OS) DZ twins, the excess being mistakenly classified as MZ by Weinberg's assumption of equal numbers. By several methods one can extract a constant value for the MZ rate and a constant or nearly constant value for the DZ SS/OS ratio, but these "constants" are actually arbitrary and they vary between populations.
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