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A behavioral correlate of blood-group discordance in dizygotic twins

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Within pair variances of Wechsler verbal intelligence test scores have been compared for fraternal twins that are concordant and those that are discordant for each of four bloodgroup system (ABO, MNSs, Rh, Duffy).

Significantly increased variances for twins discordant for the Rh system and for Duffy were found. Several possible explanations are considered but it is proposed that linkage between the bloodgroup locus and the locus of a major gene for verbal intelligence is the most likely cause.


La variance des scores du test d'intelligence verbale de Wechsler à l'intérieur de paires de jumeaux dizygotes a été comparée pour un groupe de jumeaux concordants et pour un groupe de jumeaux discordants pour chacun des quatre systèmes de groupes sanguins (ABO, MNSs, Rh, Duffy).

On a trouvé une variance significativement supérieure chez les jumeaux discordants pour les systèmes Rh et Duffy. On envisage plusieurs explications possibles, mais il semble que la cause la plus probable soit le “linkage” entre la localisation du gène du groupe sanguin et d'un gène important pour l'intelligence verbale. ZUSAMMENFASSUNG-Die Intrapaarvarianz verbaler Intelligenztestscores (Wechsler) bei dizygoten Zwillingen mit übereinstimmender bzw. verschiedener Blutgruppe (ABO, MNSs, Rh, Duffy) wurde verglichen.

Für zwei der vier untersuchten Blutgruppen (Rh und Duffy) wurde signifikant grössere Yarianz zwischen Zwillingen gefunden, die unterschiedlichen Blutgruppen angehörten. Verschiedene mögliche Erklärungen dieses Ergebnisses werden erwogen; “linkage” des Genortes für die betreffende Blutgruppe mit dem Locus eines der wichtigeren Gene für verbale Intelligenz wird als die wahrscheinlichste vorgeschlagen.

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Preparation of this paper was supported in part by N.S.F. Grant No. 1935 to the University of Chicago. We are indebted to Richard Osborne for comment on a draft of this paper.

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Bock, R.D., Bramble, W., Vandenberg, S.G. et al. A behavioral correlate of blood-group discordance in dizygotic twins. Behav Genet 1, 89–98 (1970). https://doi.org/10.1007/BF01071824

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  • Variance Significativement
  • Test Score
  • Major Gene
  • Intelligence Test
  • Dizygotic Twin