the cell cycle. life cycle of a cell before a growing cell becomes too large it divides the division...
TRANSCRIPT
The Cell CycleThe Cell Cycle
Life Cycle of a CellLife Cycle of a Cell
Before a growing cell becomes too large it divides
The division results in two essentially identical cells called “daughter cells”.
Prior to division the cell replicates all of its DNA.
Replication solves the problem of information storage, each daughter cell receives its own genetic information
Why would it be important that the cell copies itself before dividing???
What would happen if a cell split into two without copying itself? Would both sides survive?
Phases of MitosisPhases of Mitosis
InterphaseInterphase
In interphase the DNA in the nucleus is in a loose stringy form called chromatin
DNA replication takes place, copying itself to get ready for mitosis
ProphaseProphase
During prophase chromosomes become visible, centrioles take position on opposite sides of the nucleus
Nucleus disappears and the nuclear envelope breaks down
MetaphaseMetaphase
Chromosomes begin to line up across the center of the cell
Each chromosome is now connected to a spindle fiber at its centromere
AnaphaseAnaphase
The centromeres that join the sister chromotids separate creating two individual chromosomes
Chromosomes continue to move until the have separated into two groups near the poles of the spindle
TelophaseTelophase
The chromosomes gather at opposite ends of the cell
Chromosomes begin to lose their distinct shape
Two new nuclear membranes form
CytokinesisCytokinesis
Cytokinesis is the division of the cytoplasm
Occurs at same time as telophase (not a different step in mitosis)
Done a little different in plant and animal cells
Prophase Metaphase Anaphase Telophase