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Download Cell Cycle Mitosis Notes 2013
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Cell Cycle Notes http://www.youtube.com/watch?v=Q6ucKWIIFmg Biology is the only subject in which multiplication is the same thing as division… Why go through MITOSIS Multi-celled organisms – for growth • from fertilized egg to adult we need to make more cells – for repair • replace cells that die from normal wear & tear or from injury Dividing cells… • What has to be copied – DNA – organelles – lots of other molecules plant cell animal cell Cell Cycle: • Phase 1: Cell grows, copies DNA and copies organelles DNA cell nucleus Interphase DNA must be replicated… chromosomes in cell DNA in chromosomes cell nucleus 4 single-stranded chromosomes DNA must be replicated… duplicated chromosomes duplicated chromosomes 4 double-stranded chromosomes cell nucleus double-stranded human chromosomes ready for mitosis Cell Cycle: • Phase 2: DNA winds up into chromosomes and centrioles move to the poles of the cell – DNA is wound up into chromosomes to keep it organized duplicated chromosomes Prophase cell nucleus Cell Cycle: • Phase 3: Chromosomes line up in the middle of the cell • attached to protein “cables” that will help them move Metaphase duplicated chromosomes lined up in middle of cell Cell Cycle: • Phase 4: Chromosomes move away from each other (separate) – start moving to opposite ends anaphase chromosomes split & move to opposite ends Cell Cycle: • Phase 5: Cell starts to divide into two cells -Two new nuclei form Telophase Cell Cycle: • Phase 6: Cells separate and DNA unwinds – now they can do their every day jobs cytokinesis 2 New “daughter” cells • 2 exact copies of original cells – same DNA – “clones” Cell division in Animals I.P.M.A.T.C. Please Make Another Two Cells prophase interphase cytokinesis metaphase anaphase telophase Mitosis in whitefish embryo Mitosis in plant cell Types of Reproduction • Asexual – One parent cell divides into two daughter cells • http://www.youtube.com/watch?v=4JIytOL-Q18 • http://www.youtube.com/watch?v=DY9DNWcqxI4 Amoeba Red blood cells Types of Reproduction • Sexual Reproduction – Two parent cells join to for one daughter cell – http://www.youtube.com/watch?v=oSx9t5pof88 Types of Reproduction • Asexual – One parent cell divides into two daughter cells • http://www.youtube.com/watch?v=4JIytOL-Q18 Amoeba Red blood cells
