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Twinning and Blood Groups — II. Distribution of ABO, MN and Rh-Hr Phenotypes in a Twin Sample*

  • M. Milani-Comparetti (a1), D.P. Pace (a1), G. Brenci (a2), S. Damiani (a3) and L. Gedda (a2)...

Abstract

The distribution of ABO, MN and Rh-Hr phenotypes has been examined in a sample of 688 twin pairs, with particular emphasis on the ABO distribution. It appears that MZ and DZ pairs exhibit opposing deviations from the expected distribution; such deviations tend to cancel out each other in the total sample, thus masking the phenomenon.

The results are briefly discussed, calling for an extension of the study to the twins' families, while forthcoming papers will present further analyses.

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Copyright

Corresponding author

Istituto di Biologia e Genetica, Via Grotte di Posatora, 60100 Ancona, Italy

Footnotes

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*

Paper read at the Fifth International Congress of Human Genetics, Mexico City, 1976.

Footnotes

References

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Bolognesi, M., Milani-Comparetti, M. 1970. The Distribution of Human Blood Groups and Other Polymorphisms. London: Oxford Univ. Press.
Osborne, R.H., DeGeorge, F.V. 1957. Selective survival in dizygotic twins in relation to the ABO blood groups. Am. J. Hum. Genet., 11: 321327.
Renkonen, K.O., Timonen, S. 1967. Factors influencing the immunization of Rh-negative mothers. J. Med. Genet., 4: 166168.

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