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Cell Cycle Phases Interphase *Cell Membrane, nuclear membrane, cytoplasm double *Organelles double * DNA in the form of chromatin and doubled A: chromosomes, centromeres, spindle fibers and centrioles D: Nuclear membrane Centromeres in middle of cell, attached to chromosomes, which are attached to spindle fibers, which are attached to centrioles D: nuclear membrane *Centrioles tug on spindle fibers pulling chromosomes apart D: Centromeres are lost A: Two new nuclear membranes D: Spindle fibers and centrioles disappear How? * Animals- cell membrane pinches inward * Plants- Cell plate grows from center outward * Two new cells identical to parent cell and each other • Each cell contains same number of chromosomes as parent cell Interphase = 80% All Materials Double DNA duplicates and cell grows Nucleus Doubles Cell Growth Cytoplasm Divides 1. Growth 2. Replace worn out cells 3. Repair damaged cells Cells that do not go through cell cycle: Muscle & Nerve Chromosome Nuclear membrane Cell membrane
