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

Published online by Cambridge University Press:  01 August 2014

M. Milani-Comparetti
Affiliation:
Institute of Biology and Genetics, University of Ancona, Italy
D.P. Pace
Affiliation:
Institute of Biology and Genetics, University of Ancona, Italy
G. Brenci
Affiliation:
The Gregor Mendel Institute for Medical Genetics and Twin Studies, Rome, Italy
S. Damiani
Affiliation:
Chair of Biometry, School of Statistics, University of Rome, Italy
L. Gedda
Affiliation:
The Gregor Mendel Institute for Medical Genetics and Twin Studies, Rome, Italy

Abstract

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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.

Type
Brief Report
Copyright
Copyright © The International Society for Twin Studies 1977

Footnotes

*

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

References

REFERENCES

Bolognesi, M., Milani-Comparetti, M. 1970. The Distribution of Human Blood Groups and Other Polymorphisms. London: Oxford Univ. Press.Google Scholar
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.Google Scholar
Renkonen, K.O., Timonen, S. 1967. Factors influencing the immunization of Rh-negative mothers. J. Med. Genet., 4: 166168.Google Scholar