Handedness in twins according to zygosity and chorion type: a preliminary report.
In the course of the East Flanders Prospective Twin Survey (EFPTS), handedness was assessed as part of a genealogical study (Meulemans et al., 1995) in 1616 twins (808 twin pairs) aged 6 to 28. Our findings are that, in this large population-based study with known placentation and zygosity, the often observed higher frequency of left-handedness in twins is confirmed, that it appears to be independent of zygosity and chorion type, and that the belief that discordant handedness in monozygotic twins represents mirror-imaging is mythical.
Derom
C
C
Centre for Human Genetics, Katholieke Universiteit Leuven, Belgium.
Thiery
E
E
Vlietinck
R
R
Loos
R
R
Derom
R
R
D000293:Adolescent; D000328:Adult; D001530:Belgium; D002648:Child; D005260:Female; D007839:Functional Laterality / Q000235:genetics*; D006801:Humans; D008297:Male; D010929:Placentation / Q000235:genetics*; D011247:Pregnancy; D011446:Prospective Studies; D014429:Twins, Dizygotic / Q000235:genetics*; D014430:Twins, Monozygotic / Q000235:genetics*