cell theory says...
All cells com from preexisting cells, so cells must divide by making a copy of themselves in order to produce more cells
Difference of mother and daughter cells
Two IDENTICAL daughter cells are being produced
Relation of mother and daughter cells
Daughter cells are IDENTICAL to the mother cell
Two reasons cells must divide:
1. To grow in size (number of cells increase through cell division)
2. Repair dead or lost cells (cells need to replace other cells through cell division)
Reason single- celled organisms undergo cell division
To reproduce (make more cells)
Asexual reproduction
A single celled parent reproduces genetically identical offspring without the presence of a sperm and egg.
How multi-cellular organisms reproduce
sexual reproduction
binary fission
Asexual reproduction of bacteria
process of binary fission
1.) cell replicates (copies) its single piece of DNA and the copies move apart
2.) the cell enlongates, the membrane grows, and then divides the cell
3.) result: two identical bacterial cells
Before dividing cells must...
copy DNA ad organelles, so that there will be an equal amount of DNA for future cells
Cell cycle
Process cells go through when they divide
2 parts of cell cycle
1. Interphase (preparation for division)
2. Mitotic phase (dividing)
Start of the cell cycle
Begins at interphase
Interphase
(G1)-cell growth and replication
(G2)-DNA is synthesized
(G2)- Cell gets bigger;2x material
Mitotic Phase- 2 parts
Mitosis: Dividing of the nucleus
Cytokinesis: The cytoplasm divides
4 steps of mitosis
1. Prophase
2. Metaphase
3. Anaphase
4. Telophase
End of mitosis...
Two IDENTICAL daughter cells.