The Claim: Twins Always Skip a Generation | Twin gene

Health|TheClaim:TwinsAlwaysSkipaGenerationhttps://www.nytimes.com/2007/10/02/health/02real.htmlAdvertisementContinuereadingthemainstoryTHEFACTSPeoplewithtwinsintheirextendedfamiliesmaywonderwhetheracribfortwoisintheirfuture,too.Accordingtoconventionalwisdom,twinsnotonlyruninfamilies,buttheyalso—forsomestrangereason—alwaysskipatleastonegeneration.Itisaclaimthatiswidelyrepeated,butonlypartlytrue.ImageCredit...LeifParsonsScientistshaveknownforsometimethatthereisagenethatcanpredisposewomentohyperovulation,orreleasingtwoormoreeggsinasinglemenstrualcycle.Whenbotheggsarefertilized,theresultingsiblingsarefraternaltwins.Becausethisgenecanbepassedon,thetendencytohavefraternaltwinscaninfactruninfamilies.Identicaltwins,ontheotherhand,resultfromonefertilizedeggrandomlysplittingintwo,creatingtwosiblingswithidenticalDNA.Becausethereisnoknowngenethatinfluencesthisprocess,itisconsideredamerecoincidencewhenoneextendedfamilyhasmultiplesetsofidenticaltwins.Thenotionthattwinsalwaysskipagenerationisalsoamyth.Theillusionmayhavearisenbecausemenwhoinheritthegenefromtheirmothersareunaffectedbyit(theydonotovulate),butcanstillpassitontotheirdaughters,who,inturn,willhaveanincreasedlikelihoodofconceivingtwins.THEBOTTOMLINETwinscanruninfamilies,butdonotnecessarilybypassgenerations.AdvertisementContinuereadingthemainstorySiteIndex

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