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& SPI.1.6 Determine the relationship between cell growth and cell reproduction. Multicellular • Growth • Repair Unicellular • Reproduction –Binary fission http://www.biology.arizona.edu/cell_bio/tutorials/cell_cycle/cells2.html MITOSIS G2 (Gap 2) 1 M 2 G1 (Gap 1) S-Phase (DNA SelfReplication) THE CELL CYCLE ~ The Life Cycle of The Cell • Purpose: Form TWO Nuclei • Goal: –Same kind of DNA –Same number of DNA Chromosome Condensed (wrapped up) Chromatin Thin thread like Chromatid 2 chromosomes held together by a centromere INTERPHASE: Gap 1 Normal cell functions INTERPHASE is not a stage of mitosis ! Gap 2 S-phase Prep for Mitosis Synthesis of DNA Biological Science, a Molecular Approach. BSCS Blue Version. Heath and Company, 1996. Nuclear membrane present Centrioles Nucleolus visible DNAchromatin Centrioles migrate to poles of the cell Spindle forms nuclear envelope disappears nucleolus disappears chromosomes condense ____________ This organizes the DNA Chromatids line up in the MIDDLE of the cell Middle of the cell is called the equator.. __________ Chromatids move AWAY… Chromatids separate & move towards the poles Chromosome unwind into chromatin Spindle fibers disappear Nuclear membrane reforms Nucleolus reappears 1 5 2 3 4 6 7 • The division of the cytoplasm and the rest of the cell besides the nucleus. Plant • Cell Plate • Inside Out Animal • Cleavage Furrow • Outside In • Uncontrolled cell growth • Cells do not respond to regulation signals • Cause tumors • Defect in tumor suppressor gene