McClintock waxay aragtay burburka iyo isku dhafka chromosomes ee unugyada hadhuudhka hadhuudhka. Waxay sidoo kale awood u yeelatay inay muujiso in, dhirta qaarkood, burburka chromosome ee iskeed u dhaca unugyada endosperm. Intii lagu jiray mitosis, waxay aragtay in dhamaadka chromatids jabay ay dib u midoobeen ka dib markii iskudhafka chromosome. In mid ka mid ah mitaphase ee mitosis, chromosomes jabay sameeyay buundada chromatid, kaas oo la jebiyey markii chromatids u dhaqaaqay dhinaca poles cell.
Machadka Carnegie ee Washington