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Number of different handedness combinations in monozygotic and same sex dizygotic twins. (Combined results, adapted from McManus (1991). L, left; R, right.)
| handedness | monozygotic | dizygotic |
|---|---|---|
| R–R | 2184 | 1951 |
| R–L | 629 | 585 |
| L–L | 87 | 53 |
| observed/expected discordant pairs (%) | 90.1 | 99.3 |
