The M Quadruplets II. The Interpretation of Quantitative Differences

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Abstract
Summary Early students of the M quadruplets considered that the dermatoglyphic traits and physical measurements corroborated a monozygotic origin. More careful analysis in terms of variance shows that the ridge counts, at least, are quite inconsistent with data from monozygotic twins. However, when several quantitative measures are considered together by a method of combined relative likelihoods of separate pair differences, the evidence against monozygosity is less impressive than the contrary evidence from qualitative traits including blood groups. It is concluded that quadruplets tend to vary more than twins and/or that some genotypes are much more variable than others, at least with respect to dermal ridge counts.

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