I whanau a Barbara McClintock ki a Eleanor McClintock i te 16 o Hune 1902 i Hartford, Connecticut, ko ia te tuatoru o nga tamariki e wha i whanau ki te taote homeopathic a Thomas Henry McClintock me Sara Handy McClintock. Ko Thomas McClintock te tamaiti o nga manene o Ingarangi; I heke mai a Sara Ryder Handy mai i te whanau tawhito o Amerika o Mayflower. I whanau a Marjorie, te tamaiti matamua, i te Oketopa 1898; I whanau a Mignon, te tamahine tuarua, i te Noema 1900. Ko te taiohi, a Malcolm Rider (i huaina ko Tom), i whanau 18 marama i muri i a Barbara. I te mea he kotiro iti, i whakatau ona maatua ko Eleanor, he ingoa "pai" me te "tino", kaore i te tika mo ia, a ka kowhiri a Barbara McClintock. He tamaiti motuhake a McClintock i te timatanga o te tau, i muri mai ka whakaarohia e ia ko "clintock".
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