Lab 3A - mitosis - Introduction ,discreteunitsof

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AP Biology Lab 3A – THE CELL CYCLE Introduction The nuclei in cells of eukaryotic organisms contain chromosomes with clusters of  genes , discrete units of  hereditary information consisting of double-stranded DNA. Structural proteins in the chromosomes organize the DNA and participate in DNA folding and condensation.  When cells divide, chromosomes and genes are duplicated and passed onto daughter cells. Single-celled  organisms divide for  reproduction . Multicellular organisms have reproductive cells (eggs and sperm), but they also  have somatic (body) cells that divide for  growth  or  reproduction . In body cells and single-celled organisms, the nucleus divides by  mitosis  into two daughter nuclei, which have  the same number of chromosomes and the same genes as the parent cell. Division of the nucleus is generally  followed by division of the cytoplasm ( cytokinesis ). Events from the beginning of one cell division to the beginning of the next are collectively called the 
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Lab 3A - mitosis - Introduction ,discreteunitsof

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