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Nucleus parts nuclear envelope (membrane) houses DNA chromosomes sections of DNA each section - gene transcription in to mRNA from DNA for Ribosome to translate to protein functions reproduction DNA replication cell divisions mitosis somatic cells (non gametes) create new cells with 100% of material 3 groups stabile normally do not divide but can divide to recover labile constantly dividing quickly examples bone marrow (120 days) epithelial cells (stomach 2 days skin 14 days) permanent never divide after completing growth meiosis gametes produce sperm egg 1/2 of DNA material in sperm/egg

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