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Published bySherman Riley Modified over 9 years ago
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Ch 10 Mitosis
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Cell Growth Limits to Cell Growth –Why do cells divide? The larger a cell gets, the more demands the cell puts on the DNA
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Cell Growth Before a cell gets too big, it divides forming two identical “daughter cells”
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Cell Division Every cell must copy its DNA before cell division begins. Each daughter cell then gets a copy of that DNA In eukaryotes, cell division begins with the division of the nucleus called mitosis.
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Chromosomes Genetic information is passed on by chromosomes Chromosomes are made of DNA Each chromosome is made of 2 sister chromatids and joined at the centromere.
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Chromosomes When a cell is not in cell division, the DNA is found in the form of chromatin, not as chromosomes. DNA condenses to form chromosomes before cell division.
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The Cell Cycle During the cell cycle a cell grows, prepares for division, and divides to form two daughter cells, each of which begins the cycle again. Interphase – Cell is preparing for division (G 1, S, and G 2 phase) AFTER Interphase, Mitosis begins. The daughter cells then enter Interphase. **CYCLE**
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Cell Cycle Animation Cell Cycle Animation p.2
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Mitosis (PMAT) 1. Prophase Chromosomes condense and become visible Centrioles separate and get on opposite sides of the nucleus Centrioles help to organize the spindle fibers **Mitosis occurs in Somatic Cells (body cells) when new cells are needed.**
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Mitosis (PMAT) 2. Metaphase Chromosomes line up across the center of the cell
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Mitosis (PMAT) 3. Anaphase The centromeres that holds the chromatids together split The spindle helps pull the pair of chromosomes apart
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Mitosis (PMAT) 4. Telophase Chromosomes gather at opposite ends of the cell Two new nuclear envelopes form
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Mitosis
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Uncontrolled Cell Growth Cancerous tumors are caused because cancer cells do not respond to the signals that regulate the growth of most cells.
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