Transcript Mitosis Diagram

Mitosis Diagram
Interphase
It appears as if the cell is resting…some cells are in G0
During the G1 the cell will grow and produce all the
necessary proteins for DNA synthesis
During S the cell replicates its DNA...so it now has 2
complete sets of DNA. This allows the cell to divide into
two daughter cells, each with a complete copy of DNA.
During the G2 the cell again undergoes growth and protein
synthesis, because it needs enough proteins for 2 cells.
Cells spend most of their time in this phase
What does Interphase look like? (PICTURE 1)
Centrioles will apprear
Chromatin is visible
Double membrane Nuclear membrane is
visible
The “M” phase: Nuclear Division
This is the process of forming identical daughter cells by
replicating and dividing the original chromosomes.
Prophase, metaphase, anaphase, telophase, & cytokinesis
Prophase: (longest phase of Mitosis) (PICTURE #2)
•Nuclear envelope fades disappears
•Nucleolus disappears
•Chromatin condenses (shortens and thickens) to become chromosomes
•Later, spindle starts to form (spindle composed of microtubules - like
muscles)
•Centrioles move to opposite ends
Metaphase: (PICTURE #3)
•Double stranded Chromosomes line up across center (equator)
•Each centromere becomes attached to spindle fiber
•Very end of metaphase - centromeres divide
Anaphase: (PICTURE #4)
•Each centromere divides
•Two strands of chromosome separate
•Separate strands of chromsomes move towards opposite ends
Telophase: (PICTURE #4)
•Centrioles and spindle fibers disapprear
•Chromosomes stretch out to CHROMATIN
•Nuclear membrane re-appears
•Nucleolus re-appears
•Two daughter cells are visible!!!!!
Cytokinesis:
•Division of the cytoplasm completes the “M” phase
•Slightly different for plant and animal cells
The plant will from a cell plant derived from the golgi bodies
Picture of Plant Cell vs. Animal Cell
during CYTOKINESIS
FORMATION OF THE
CELL PLATE
What phase of is this?
PROPHASE!!!!!
What phase is this?
METAPHASE!!!!!
What phase is this?
ANAPHASE!!!!!
What phase is this?
TELOPHASE!!!!!
What is the purpose of MITOSIS?
To make a master copy of the nucleus!!!!! (A CLONE!!!!)
Constant number of chromosomes for each species
1. Humans = 46
2. A sunflower = 4
3. A fern = 1250
Stage Time %
Interphase 17 hours 90.3%
Prophase 1.3
6.9 %
Metaphase 0.24
1.3 %
Anaphase 0.07
0.4 %
Telophase 0.22
1.2 %
TOTAL 18.83 hours