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Lab 5 Mitosis Division What is Mitotic Cell Division? Division of somatic cells (body cells)• (non reproductive cells) in eukaryotic organisms A single cell divides into two• identical daughter cells (cellular reproduction) => Maintains chromosome ploidy of cell Ploidy – refers to the number of pairs of chromosomes in cells haploid – one copy of each• chromosome – designated as “n” diploid – two copies (= pair) of each• chromosome – designated as “2n” As a cell enters mitosis from interphase it has 2 complete sets of chromosomes because of replication in the S phase. Each set must be rearranged and distributed into the 2 new daughter nuclei. This is mitosis. Cell Division Mitosis includes 4 stages : 1- Prophase . 2-Metaphase. 3-Anaphase. 4-Telophase. 1-Prophase. -Chromatin condenses (coils) into chromosomes. Sister chromatids joined by centromere. -Nuclear membrane dissolves. -Centrioles divide and move to opposite poles forming spindle between them. chromatin nucleus nucleolus centrioles condensing chromosomes 2-Metaphase. - Sister chromatids line up on metaphase plate. -Centromeres lock on to spindle fibre 3-Anaphase . Centromeres divide. -Spindle fibres contract pulling sister chromatids apart to poles. - 4-Telophase. -New nuclear membranes form around new nuclei Thank you for listening T: Aldanah Alqahtani .