HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY
Mitosis. Light micrograph of hyacinth root cells in the initial stage of mitosis (nuclear division). The majority of the cells are in interphase, between divisions. In cells at upper centre and centre right the chromosomes, which consist of deoxyribonucleic acid (DNA, red) have started to condense as the cells enter prophase. Mitosis is the formation of two daughter nuclei from one parent nucleus. During mitosis the chromosomes, which contain two identical chromatids, are separated and divided equally between the cells. A new cell wall then grows between the two daughter cells (cytokinesis, cellular division). Magnification: x450 when printed at 10 centimetres wide.
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