3.24 Mitosis

• Mitosis- Cell division - Growth - Increase in cell count
• Cell - 46 chromosomes - diploid number - abbreviation : 2N
• Humans: 46
• Cats: 38
• The cell divides in two that contains a diploid nucleus - identical 'twins' - Exact copy of the original - Called DNA replication
• Same number of chromosomes
• Same set of chromosomes
• The two copies are held together by the 'centrometre' - Makes pair of 'Chromatids'
• DNA replication happens inside nucleus - process is known as: Cell Cycle
• Prophase - When the nucleaus starts breaking down and the chromosomes become visible as a pair of chromatids in the process of Mitosis begins
• Protine molecules create spindle grow where the chromatids move and join on to
• Metaphase - Spindle fibers + Chromatid attach through the centrometre
• Anaphase - The fiber + Chromatid shortens and gets pulled apart - moves away from another - becomes separated pars of chromatids
• Telophase - Nucleus begins to regorm around the chromosome of both cells (Last phase)
• Cytokinesis - when the cell splits into 2 - NOT PART OF MITOSIS