Warm up – 3-2-1 Countdown
3 –What are three differences between
photosynthesis & respiration?
2 –What are two similarities between
photosynthesis & respiration?
1 –What is the relationship between the two
processes?
Warm up - Photosynthesis
 Identify the missing raw materials and products of
photosynthesis:
4.
3.
1.
2.
BrainPop Video - Photosynthesis
Cell Division
Cell Division
Amoeba Sisters – Mitosis video
WHY do cells divide (make more cells)?
1. To grow
2. To replace dead cells
3. To repair damaged cells
Human Development
 So, the division of cells is how we become multicellular!
Cell Division/ Cell Cycle
 Asexual reproduction – reproduction
involving one (or a) parent cell
 Cell division – a type of asexual reproduction
where one cell divides and becomes two
identical copies of itself.
 Mitosis – a special part of cell division where the
nucleus of the cell makes a copy of itself and then
divides into two new nuclei.
The Cell Cycle Foldable:
1.
Tape the blank papers in the format on
the next page.
 Label each paper.
 Draw arrows.
Write notes under each flap (from the
PPT).
3. Illustrate each step on the cover of each
flap.
2.
1. Interphase
2a. Mitosis:
Prophase
3. cytokinesis
The
Cell Cycle
2d. Mitosis:
Telophase
Pgs. 90-91
2c. Mitosis:
Anaphase
2b. Mitosis:
Metaphase
BrainPop video clip: Mitosis
1. Interphase



Longest stage
Cell grows
Chromosomes are copied


Chromatids – the two chromosome copies
Centromere – region where chromatids are held together
Chromosomes
Mitosis - overview
 Mitosis – process of cell division that forms two
new nuclei, each of which has the same number
of chromosomes.
 4 phases:
1. Prophase
2. Metaphase
3. Anaphase
4. Telophase
2a. Mitosis (Prophase)
 Prophase = chromosomes “pair” up with their copy.
 Prophase= chromosomes “pair” up with their
copy.
 Chromosomes twist, coil & condense into an “X”
shape
 Spindle fibers form
 Nuclear membrane begins to break down
2b. Mitosis (Metaphase)
 Nuclear membrane disappears
 Chromatid pairs line up in the middle of the cell
 metaphase = middle
2c. Mitosis (Anaphase)
 Chromatids separate
 Chromatids move apart to opposite sides of the cell
 anaphase = apart
 Cell becomes stretched
2d. Mitosis (Telophase)
 Two nuclear membranes form around each set of
chromosomes
 telophase = two new nuclear membranes
 Mitosis is over
3. Cytokinesis
 Cell divides in two
 Cells without a cell wall (ex: animal cells):
 Cell pinches in two
 Cells with a cell wall (ex: plants):
 A cell plate forms between the two new cells
Demo of Mitosis
 See “Cells Alive” video/demo
 http://cellsalive.com/mitosis.htm
WARM UP:
Which phase of the cell cycle?
a. Interphase
b. Telophase
c. Anaphase
d. Metaphase
Place the following Cell Cycle illustrations
in order:
A
B
C
D
E
F
Cell Cycle/Mitosis Review
 BrainPop - Mitosis
How many cells? How many chromosomes?
(TOC #44)
PARENT CELL
Example:
Human Skin Cell
46
Interphase – chromosomes are copied
92
46
Prophase - pair up
Metaphase – middle
Anaphase – apart
Telophase – two nuclei
Cytokinesis – cell splits in 2
46
DAUGHTER CELLS
Review Question:
A cell with 10 chromosomes undergoes mitosis
and cell division. How many daughter cells are
produced and what number of chromosomes do
they have?
a) 2 daughter cells, 5 chromosomes each
b) 1 daughter cell, 10 chromosomes each
c) 4 daughter cells, 20 chromosomes each
d) 2 daughter cells, 10 chromosomes each