University:
High School
Course:
High School Biochemistry
Academic year:

2023
Views:

500

Pages:

10
Author:

Clint W.

Cell Division and Mitosis Life of a cell Cell Cycle • Makes up the entire life of the cell • Consists of 2 main parts – Interphase and Cell Division • Interphase is divided into 3 stages – G1(growth 1) – S1 (DNA Synthesis) – G2 (growth 2 organelles copied) • Cell Division is divided into 2 stages (mitosis, cytokinesis) Mitosis = division of 1 diploid nucleus into 2 identical diploid nuclei • Diploid cell (2n). – cells with 2 of every chromosome. • All somatic cells undergo mitosis for growth, repair or replacement of old cells Prophase – 1st phase of mitosis. • Chromosomes are now visible • Centrioles form spindle • Nuclear envelope/membrane breaks apart Metaphase – 2nd phase • Chromosomes meet in middle. • Spindles attach to centromere • Nuclear envelope/membrane is gone. Anaphase – 3rd phase • Chromatids move away from each other. • Spindles pull chromatids apart • The nuclear envelope/membrane still absent Telophase – 4th phase • Chromosomes begin to disappear. • Spindle fibers disappear • Two new nuclear envelopes/membranes begin to form Cytokinesis • Division of the cell membrane and cytoplasm. • Forms two new Daughter cells – Not one old and one new because of semiconservative replication Mitosis - Overview Mitosis in an actual cell

Mitosis and Cell Cycle

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