Presentation on theme: "MITOSIS. Mitosis and the Cell Cycle Sexual reproduction – combining genetic info from 2 organisms of the same species to create offspring Asexual reproduction."— Presentation transcript:
Three reasons why cells reproduce by asexual reproduction: 1. Growth 2. Repair 3. Replacement Skin cancer - the abnormal growth of skin cells - most often develops on skin exposed to the sun.
The Cell Cycle The sequence of growth and division of a cell. 95% of cell cycle in interphase 5% of cell cycle in mitosis Interphase, mitosis, cytokinesis
Interphase Growth Stage 1 (G 1 ) – metabolic activity of the cell Synthesis Stage (S) – metabolic activity of the cell, replication of DNA Growth Stage 2 (G 2 ) – metabolic activity of the cell, prepare for division
Interphase Normal cell life functions Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
MITOSIS is the process of the nucleus of the cell duplicating and dividing There are four phases of mitosis. PROPHASE METAPHASE ANAPHASE TELOPHASE
Prophase (DNA has already copied itself) Nuclear membrane fades Chromosomes condense – can see sister chromatids and centromere Spindle forms Centrioles start to move to opposite poles