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Mitosis && Meiosis
Stuff happens.
15
Biology
9th Grade
11/08/2010

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Term
cell cycle
Definition
Highly regulated process, linked to the growth and differentiation of tissues.
Term
G1
Definition
First interphase stage
Term
S
Definition
Second interphase stage
Term
G2
Definition
Third interphase stage
Term
M
Definition
Mitotic phase
Term
Cell cycle order
Definition
G1 S G2 M
Term
Stage G1
Definition
Intense biochemical and bio-synthetic activity growth. Cell doubles in size, new organelles produced.
Term
Stage S
Definition
Synthesis of DNA takes place. Each chromosome replicated, complete copy of the genome, two identical sister chromatids held together at the centromere.
Term
Stage G2
Definition
Cell prepares for mitosis, making any of the components still needed to complete cell division.
Term
Stage M
Definition
The stage in which the cell divides to create two similar but smaller daughter cells.
Term
Prophase
Definition
You can start to see the chromosomes. Begins with the condensation and seperation of chromosomes. Nuclear envelope disappears.  The cytoplasm makes a football shaped structure called the mitotic spindle.
Term
Metaphase
Definition
The two centrioles are at opposite poles of the cell, with the spindly fully elongated between them, spanning the length of the cell.  Gathers in a plane across the center of the cell.  Spindle is now fully formed.  
Term
Anaphase
Definition
During S phase, each chromosome is replicated. During anaphase, the two sister chromatids in each chromosome are pulled apart by the kinetochore and spindle fibers.  The spindle microtubules that are not attached anymore grow longer, pushing the polls further away.
Term
Telophase
Definition
The sister chromatids have been pulled apart, a complete copy of the genome. At this point, the spindle apparatus of the cell disappears. A nuclear membrane reforms around each set of chromosomes.
Term
Cytokinesis
Definition
The cells cytoplasm divides, completing the process.
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