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Lab 5

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.

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Lab 5

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  1. Lab 5 Mitosis Division

  2. 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

  3. Ploidy – refers to the numberofpairs of chromosomes in cells • haploid – one copy of each • chromosome • – designated as “n” • diploid – two copies (= pair) of each • chromosome • – designated as “2n”

  4. 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 re-arranged and distributed into the 2 new daughter nuclei. This is mitosis.

  5. Cell Division Mitosis includes 4 stages : 1- Prophase . 2-Metaphase. 3-Anaphase. 4-Telophase.

  6. 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.

  7. condensing chromosomes chromatin nucleus nucleolus centrioles

  8. 2-Metaphase. -Sister chromatids line up on metaphase plate. -Centromeres lock on to spindle fibre

  9. 3-Anaphase . -Centromeres divide. -Spindle fibres contract pulling sister chromatids apart to poles.

  10. 4-Telophase. -New nuclear membranes form around new nuclei

  11. Thank you for listening T: AldanahAlqahtani .

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