O powstawaniu Polaków. Tomasz Ulanowski

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O powstawaniu Polaków - Tomasz Ulanowski


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którzy przekonywali, że gdy bliskowschodni rolnicy przenosili się do Europy całymi rodzinami, wśród imigrantów z kultury grobów jamowych dominowali mężczyźni. Według obliczeń badaczy przez kilka pokoleń do środkowej części kontynentu przybywało aż dziesięciokrotnie więcej eurazjatyckich pasterzy niż pasterek.

      Wnioski wysnuto, badając liczbę chromosomów X w materiale genetycznym pochodzącym ze szczątków Europejczyków z ostatnich dziesięciu tysięcy lat, dzięki czemu można było dostrzec pojawianie się kolejnych europejskich imigrantów niosących nowe warianty genetyczne. X, jak pamiętamy, to żeński chromosom płci. Może być przekazany dzieciom przez oboje rodziców. Dziewczynki są nosicielkami dwóch chromosomów X: jednego po mamie, drugiego po tacie. Chłopcy to XY – od taty dostają Y. Co z tego wynika? Ano to, że w populacji, która składa się mniej więcej z takiej samej liczby osobników obu płci, chromosomów X jest trzy razy więcej niż Y. Jednak w badaniach stanfordzko-uppsalskich ta proporcja była mocno zaburzona na korzyść igreków.

      Co jednak ciekawe, kiedy profesor Reich i doktor Lazaridis z Harvardu spróbowali powtórzyć wyniki badań kolegów ze Stanfordu i Uppsali, nie udało im się tego zrobić. Dlaczego? Jak kilka miesięcy później pisali, również w tygodniku „PNAS”62

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