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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.
Consists of four stages:
Cell Division and Definitions
Before cell division begins, each cell must
copy its DNA so that each daughter cell
gets a complete copy of the genetic
Mitosis: division of cell nucleus
Cytokinesis: division of cytoplasm
Chromosomes carry genetic information;
made of DNA
Not visible in most cells until cell division
Occurs in ALL eukaryotic cells except sex
Broken down into the following stages:
G1: growth phase
S: chromosomes replicate
G2: growth phase
Chromatin condenses into chromosomes
Centrioles separate and a spindle begins
to form
Nuclear envelope breaks down
Chromosomes line up across the center of
the cell
Each chromosome is connected to a
spindle fiber at its centromere
Sister chromatids separate into individual
chromosomes and are moved apart.
Chromosomes gather at opposite ends of
the cell and lose their distinct shapes
2 nuclear envelopes form
The cytoplasm pinches in half
Each daughter cell has an identical set of
duplicate chromosomes.
Animal cell pinches.
Plant cell has a cell plate form between
the two.