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Di agnosti c advances have made i t possi bl e to use ul tr asonogr aph to assess pl acentati on and ther efor e zygosi ty i n uter o i n the case of monochor i oni c-monozygoti c tw i ns. Foetal behavi our of 15 monozygotic and 15 unlike-sexed dizygotic twin pairs was studi ed ser i al l y w i th ul tr asounds fr om 10 to 22 w eek s gestati onal age. Each tw i n, r egar dl ess of i ts zygosi ty, show ed i ndi vi dual i sed behavi our al styl es. One tw i n w as found to be 'domi nant' i n thedoi:10.1375/twin.2.4.264 fatcat:3uzr5pvndfgyzhslv2gl7e44zi