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BioFlix: Mitosis: Chromosome Duplication

by Pearson
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This soccer players' knee will be as good as new in a few weeks thanks to mitosis, a type of cell division that generates new cells for growth and repair. Let's move into a cell to witness the events of mitosis. Before a cell can divide, it must first duplicate the chromosomes stored in its nucleus. During chromosome duplication, several bubbles open up along the chromosome. Each bubble grows until it merges with an adjacent bubble. Each chromosome now consists of two identical copies called sister chromatids. Getting closer, we see that each sister chromatid consists of DNA wound around small proteins called histones. The sister chromatids begin to coil into tight helical fibers.
This soccer players' knee will be as good as new in a few weeks thanks to mitosis, a type of cell division that generates new cells for growth and repair. Let's move into a cell to witness the events of mitosis. Before a cell can divide, it must first duplicate the chromosomes stored in its nucleus. During chromosome duplication, several bubbles open up along the chromosome. Each bubble grows until it merges with an adjacent bubble. Each chromosome now consists of two identical copies called sister chromatids. Getting closer, we see that each sister chromatid consists of DNA wound around small proteins called histones. The sister chromatids begin to coil into tight helical fibers.