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Transcript of Cell Cycle
and DNA Replication
Process by which DNA code is copied
Occurs during S phase of interphase
Cells need an exact copy of DNA
Each new double helix of DNA contains one strand from original molecule and one newly created strand
1. I will be able to identify the different stages in the cell cycle
2. I will be able to describe the process of DNA replication and explain its importance in the cell cycle.
First phase of cell cycle
G1 phase – primary growth phase
S phase – DNA replication
G2 phase – second period of growth
organelles replicate throughout
First phase of Mitosis
Nuclear membrane breaks down and disappears
Centriole pairs at opposite ends of cell
Chromosomes pushed and pulled by spindle fibers
Chromosomes arranged along spindle equator
Spindle fibers shorten, pulling chromatids apart at centromere
Chromatids are now chromosomes and move to opposite ends of cell
Chromatids reach opposite poles
Spindle fibers disappear
Nuclear membrane forms
Chromosome uncoil and return to threadlike mass
Why is the cell cycle important?
• Mode of reproduction for unicellular organisms
• Mode of growth, maintenance, and replacement for multicellular organisms
Cell Cycle: I P M A T
Mitosis: P M A T
cytokinesis, centrioles, cell cycle, mitosis, interphase, prophase, metaphase, anaphase, telophase, spindle fibers, chromosome, chromatid, chromatin,