1. 2-2d Cell Cycle
Chapters 5-1, 5-2, 5-5

2. Cells have a life cycle just like other living organisms
“Born, live, die”
Cells reproduce through division
An existing cell divides into 2 new cells
There are 2 types reproduction
Sexual
Asexual

3. Asexual Reproduction
Asexual reproduction is the creation of offspring from a single parent.
Binary fission produces two daughter cells genetically identical to the parent cell.
Binary fission occurs in prokaryotes.
parent cell
DNA
duplicates
cell begins
to divide
daughter
cells

4. There are benefits to asexual reproduction
Can be rapid
No need for other organisms
All the same DNA
Disadvantages
No genetic variation
No adaptation of species

5. The Cell Cycle New cells come from other existing cells
Eukaryotic cells do not undergo binary fission
Cells must divide to make new cells
New cells come from other existing cells
The original cell divides to become 2 new cells
The 2 new cells begin the cell cycle over again

6. The cell cycle is a regular pattern of growth, DNA replication, and cell division.

7. Cells divide at different rates.
The rate of cell division varies with the need for those types of cells.
Some cells are unlikely to divide (G0).

8. When cells divide – the DNA must divide evenly
The process of Mitosis ensures that the chromosomes divide equally between the 2 new cells

9. Apoptosis is programmed cell death.
Cell cycle regulation is necessary for healthy growth.
Not all cells divide – Some will die just because they are old
Apoptosis is programmed cell death.
a normal feature of healthy organisms
caused by a cell’s production of self-destructive enzymes
occurs in development of infants
webbed fingers

10. Cell division is uncontrolled in cancer.
Cancer cells form disorganized clumps called tumors.
Benign tumors remain clustered and can be removed.
Malignant tumors metastasize, or break away, and can form more tumors.
cancer cell
bloodstream
normal cell

11. Cancer cells do not carry out necessary functions.
Cancer cells come from normal cells with damage to genes involved in cell-cycle regulation.

12. Carcinogens are substances known to promote cancer.
Standard cancer treatments typically kill both cancerous and healthy cells.