Transcript The Cell Cycle

Warm-Up
What are the 5 things characteristics
of a living organism?
What are the labelled parts of this
cell that you see?
What do they do? 1.
2.
3.
The importance of cell division
Cells Divide for 3 reasons
1. Repair injuries by replacing old cells to
organism.
2. Growth of organism
3. Reproduce: Sexually or asexually
Cell Cycle
Stages through
which a cell
passes as it grows
and divides
There are 3
stages:
1. Interphase
2. Mitosis - PMAT
3. Cytokinesis
Stage 1: Interphase
• Longest stage
• Cell grows in size and DNA chromosomes
are copied (sister chromatids appear)
Stage 2: Mitosis
• The 2 copies of DNA move apart and make
2 new nuclei in the cell.
• Mitosis is broken into 4 phases: P.M.A.T.
Phase 1: PMAT
Prophase
• Chromosomes thicken and
become visible
•Nucleus starts to dissolve
•Add in drawing
Phase 2: PMAT
Metaphase
• Chromosomes meet in
middle of cell
•Add in drawing
Phase 3: PMAT
Anaphase
• Chromatids separate to
opposite sides of cell
•Add in drawing
Individual
chromosomes
Phase 4: PMAT
Telophase
• Chromosomes stretch out
and become invisible
•Nucleus starts to form
•Add in drawing
Stage 3: Cytokinesis
• The cell membrane pinches to off to form
2 new cells.
• 2 identical cells are formed
• 46 chromosomes in humans
Cytokinesis in Plants
In plants, a structure known as the cell plate forms
midway between the divided nuclei.
Cell plate
Cell wall
The cell plate gradually develops into a separating
membrane.
A cell wall then begins to appear in the cell plate.
Cell Cycle
Interphase
Mitosis - PMAT
Cytokinesis
10-2
The series of events that cells go through as
they grow and divide is called
a. the cell cycle.
b. mitosis.
c. interphase.
d. cytokinesis.
Copyright Pearson Prentice Hall
10-2
The phase of mitosis during which the
chromosomes line up across the center of the
cell is
a. prophase.
b. metaphase.
c. anaphase.
d. telophase.
Copyright Pearson Prentice Hall
10-2
During mitosis, “sister” chromatids separate from
one another during
a. telophase.
b. interphase.
c. anaphase.
d. metaphase.
Copyright Pearson Prentice Hall
To do now: Micro viewers
Complete micro viewer worksheet on the
stages of mitosis.