A mụrụ Barbara McClintock Eleanor McClintock na June 16, 1902 na Hartford, Connecticut, nke atọ n'ime ụmụ anọ a mụrụ na homeopathic dibịa Thomas Henry McClintock na Sara Handy McClintock. Thomas McClintock bụ nwa nke ndị mbata na ọpụpụ British; Sara Ryder Handy si n'ezinụlọ ochie American Mayflower ezinụlọ. Marjorie, bụ nwa mbụ, a mụrụ na October 1898; Mignon, nwa nwanyị nke abụọ, a mụrụ na November 1900. Onye nke ọdụdụ, Malcolm Rider (akpọ Tom), a mụrụ ọnwa 18 mgbe Barbara. Dị ka nwatakịrị nwanyị, ndị mụrụ ya kpebiri na Eleanor, aha "dị mma" na "dị nro", adịghị mma maka ya, wee họrọ Barbara McClintock na 1919. McClintock bụ nwatakịrị nọọrọ onwe ya na nwata, mgbe e mesịrị ọ kọwara ya dị ka "clintocktock naanị".
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