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Mitosis

Added Nov 03, 2015 •

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mitosis heals soccer player's knee

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the soccer player's name 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 bubble open up along the chromosome each bubble grows until it merges with an adjacent bubble each chromosome now consists of two sickle copies called sister chromatids getting closer we see that each sister chromatid consists of DNA wound around all proteins called histones the sister chromatids begin to coil into tight helical fibers Brookside the nucleus centrosomes that duplicated earlier move away from each other to opposite side the cell microtubules extend from the centrosomes forming the mitotic spindle  back in the nucleus the DNA forms Loops becoming more compacted these structures full back on themselves eventually condensing into a shorter and thicker Chrome consisting of two sister chromatids as the chromosomes continue to condense the nuclear envelope breaks up the array of spin 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 poles they move first one way and then the counteracting forces of the spindle eventually caused all the chromosomes to end up at the center cell as if arranged on an imaginary plate the sister chromatids are released shutter each becoming a full-fledged chromosome they 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 poles 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 gently identical daughter nuclei the cytoplasm Lights 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 of damaged cells

Uploaded by Jan Gowin.

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Mitosis

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