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The cell life cycle
- 2 main phases interphase and cell division
- 23 pairs of chromosomes
- 1 from ma and 1 from pa
- 23 single and 23 single = 23 pairs
- has to be exact ex. 3 copies of chrom 1 = down syndrome
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The cell life style
Interphase
- The time from cell formation to cell division
- G1- growth, does what it does for a living
- S-sythesis, DNA sythnesis
- G2- Growth and final preporation for cell division
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interphase
DNA Synthesis
- replication during S phase
- 1. DNA uncoils
- 2. Enzyme breaks H bonds between DNA strands
- 3. DNA polymerase builds the new DNA strands
- 4. Diagram of DNA synthesis? online?
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Cell division
- Divided into mitosis and cytokinesis
- essential for body growth and repair
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Mitosis
Prophase
- setting the sage
- nuclear envelope disinergrates
- chromotin condenses
- chromosomes form
- mitotic spindle forms
- microtubles extend from centromer
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Mitosis
Metaphase
Chromosomes line up at the equator
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Mitosis
Anaphase
- Chromosomes move down towards opposite ends
- moving in unison, in a row
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Mitosis
Telophase
- Prophase in reverse
- rebuild nuclear envelope and uncoil chromosomes
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Cytokinesis
- Division of cytoplasm
- was one cell, mow two
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