Cell Cycle Phases

Interphase cytoplasm double *Organelles double *Cell Membrane, nuclear membrane, cytoplasm double *Organelles double * DNA in the form of chromatin and doubled

Prophase spindle fibers and centrioles D: Nuclear membrane A: chromosomes, centromeres, spindle fibers and centrioles D: Nuclear membrane

Metaphase 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

Anaphase chromosomes apart D: Centromeres are lost *Centrioles tug on spindle fibers pulling chromosomes apart D: Centromeres are lost

Telophase A: Two new nuclear membranes D: Spindle fibers and centrioles disappear

Cytokinesis = cytoplasm divides How? * Animals- cell membrane pinches inward * Plants- Cell plate grows from center outward

Daughter Cells other Each cell contains same number of * Two new cells identical to parent cell and each other Each cell contains same number of chromosomes as parent cell

Cell Cycle Interphase = 80% All Materials Double DNA duplicates and cell grows Nucleus Doubles Cell Growth Cytokinesis Cytoplasm Divides

Why is cell cycle needed??? Growth 2. Replace worn out cells 3. Repair damaged cells Cells that do not go through cell cycle: Muscle & Nerve

Parent Cell Chromosome Nuclear membrane Cell membrane