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 re- arranged 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 nucleolus nucleus 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. Thank you for listening T: Aldanah Alqahtani.