The Cell Cycle The Cell Cycle Cell Cycle
- Slides: 14
The Cell Cycle
The Cell Cycle • Cell Cycle = A repeating sequence of cell growth and division during the life of a cell. • Cell division in eukaryotes = more complex due to organelles and a nucleus.
Five Stages of the Cell Cycle • Interphase: • G 1 - primary growth phase • S – synthesis; DNA replicated • G 2 - secondary growth phase • Mitotic phase • M - mitosis • C - cytokinesis
Cell Cycle
Interphase - G 1 Stage • 1 st growth stage after cell division • Cells mature by making more cytoplasm & organelles • Cell carries on its normal metabolic activities
Interphase – S Stage üSynthesis stage üDNA (chromosomes) copied Two identical copies of DNA are made Original DNA
Keeping Cells Identical The instructions for making cell parts are encoded in the DNA, so each new cell must get a complete set of the DNA molecules
Eukaryotic Chromosomes • All eukaryotic cells store genetic info in chromosomes • Most eukaryotes have between 10 and 50 chromosomes in their body cells • Human body cells have 46 chromosomes (23 pairs)
Eukaryotic Chromosomes • Each chromosome is made of tightly coiled DNA • Chromatin is the relaxed form of DNA in a cell’s nucleus • DNA can only be seen when highly coiled in chromosomes
Chromosomes in Dividing Cells • Duplicated chromosomes are called sister chromatids • Sister chromatids are held together by the centromere Called Sister Chromatids
Sister Chromatids result from the S phase! After S Phase Before S Phase
Interphase – G 2 Stage • 2 nd Growth Stage • Cell prepares for division • All cell structures needed for division are made (ex: centrioles) • Additional organelles & proteins are made
Sketch the Cell Cycle DNA Copied Cells Mature Daughter Cells prepare for Division Cell Divides into Identical cells
- Cell cycle and cell division
- Cell cycle and cell division
- Biology.arizona.edu/cell bio/activities/cell cycle/01.html
- Mitosis
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