Mitosis is the process of cell division that produces two exact copies of a cell.
It ensures equal segregation of genetic material to daughter cells. In the first part of mitosis, the chromosomes are replicated. The model organism used for this study was the budding yeast, Saccharomyces cerevisiae. The Koshland lab reports on an assay developed specifically to study DNA cohesion sequences. The fact that sister chromatids are joined along their entire length makes them harder to study than minichromatids small samples of the sister chromatids.