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which soccer players 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 which Bible grows until it merges with an adjacent bubble each chromosome now consists of two identical copies called sister chromatids getting closer each sister chromatid consists of DNA wound around small proteins called histones the sister chromatids begin to coil into tight helical fibers what side the nucleus centrosomes that duplicated earlier move away from each other to opposite sides of the cell microtubules extend from the centrosomes forming the ptotic spindle back in the nucleus the DNA forms Loops becoming more compacted these structures fullback on themselves eventually condensing into a shorter and thicker consisting of two sister chromatids as the chromosomes continue to condense the nuclear envelope breaks up the array of spindle microtubules is now extensive and the chromosomes are fully condensed spindle fibers from each pole attached to protein structures located at the centromere of each sister chromatid as the chromosomes are bound by spindle fibers from opposite they move first one way and then another the counteracting forces of the spindle eventually caused all the chromosomes to end up at the center of the cell as if arranged on an imaginary plate the sister chromatids are released from each other each becoming a full-fledged chromosomes move toward opposite poles of the cell pulled along the spindle fibers attach to them at the same time overlapping spindle fibers that are not attached to chromosomes continue to lengthen pushing the polls farther apart what's the chromosomes arrive at their destination they become less condensed two new nuclear envelopes form completing mitosis the division of one nucleus into two genetically identical daughter nuclei the cytoplasm it's by the process of cytokinesis forming two separate daughter cells in your body millions of cells divide every second providing new cells for growth and for repair damaged cells

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