1. Complete Most Missed Quiz: DNA – then complete the bellwork.
2. Copy the paragraph and fill in the blanks using these words:
G1
G2
interphase mitosis
replicate
synthesis
MITOSIS is the process of cell division or growing more cells. Before a cell can divide, it must
REPLICATE its DNA. Prior to replicating the DNA, the chromosomes grow and prepare
themselves for DNA replication in the G1 phase. The chromosomes replicate themselves in the
S or SYNTHESIS phase of the cell cycle. After the S phase, the cell goes through the G2 phase
where it prepares itself for mitosis. The G1, S, and G2 stages are collectively called
INTERPHASE.
Collect Today
Page 56 – Interphase Handout
Assigned
Buff Binder Quiz #1 Makeup – (Today)
T/T Quiz Makeup – (Wednesday)
Cell Cycle/Vocabulary Quiz – (Thursday)
Page 58 – Cell Cycle Foldable (Thursday)
Late
Page 53 - Codon Face Project (-50%)
Unit 4 – Cell Cycle
Definitions Due Friday (11/6/15)
All Parts Due Friday (11/13/15)
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
Allele
Anaphase
Cancer
Cell Cycle
Centriole
Centromere
Chromatid
Chromosome
Crossing Over
Cytokinesis
Daughter Cell
12. Diploid
13. Electrophoresis
14. Frameshift
Mutation
15. Gamete
16. Gene
17. Genetic Disorder
18. Genome
19. Haploid
20. Interphase
21. Karyotype
22. Meiosis
23.
24.
25.
26.
27.
28.
29.
Pg 54
Metaphase
Mitosis
Mutation
Offspring
Point Mutation
Prophase
Sexual
Reproduction
30. Somatic
31. Telophase
32. Tumor
Essential Question
Pg 57
What are the four stages of
mitosis?
Standard
B.5A – Describe the stages of the Cell Cycle, including
Deoxyribonucleic acid (DNA) replication and mitosis, and the
importance of the cell cycle to the growth of an organism.
Cell Cycle Re-cap
1.
2.
3.
4.
G1
S phase
G2
M phase
Remember that G1, S, and G2 together are known as
interphase and a cell spends most of it’s life in interphase.
Reasons for cell division
1. To prevent them from being inefficient in getting
nutrients
• surface area to volume ratio
2. To reproduce
• For example: bacteria can reproduce asexually
3. To repair damaged tissue
• For example: if you get a paper cut
4. To grow an organism
Mitosis in the Cell
There are many words
that describe DNA in
it’s various forms…
A. DNA is usually found
as chromatin while
the cell is doing its
normal job.
1. Chromatin is the
granular material
visible within the
nucleus that consists
of DNA tightly coiled
around proteins.
B. Before a cell
divides, chromatin
(DNA) coils up to form
chromosomes.
1.Chromosomes are
made up of DNA and
proteins.
2. All organisms do not
have the same number
of chromosomes.
3. Human cells have 46
chromosomes.
4. Chromosomes are
only visible during cell
division.
C. Before each cell
division, each
chromosome is
replicated, or copied.
D. For this reason,
each chromosome
DRAW AND
consists of two
identical sister
LABEL
chromatids.
E. Each pair of sister
chromatids is attached
at an area called the
centromere.
DRAW AND
LABEL
A human body cell
entering cell division
contains 46
chromosomes or 92
chromatids.
Now let’s talk about mitosis…
II. The two main stages of cell division are mitosis and
cytokinesis.
•Cyto = Cell
•Kinesis =
Movement
A. The first stage,
division of the cell
nucleus, is called
mitosis.
B. The second
stage, division of
the cytoplasm, is
called cytokinesis.
C. Reproduction by mitosis is
classified as asexual.
1. Unicellular organisms
reproduce in this manner.
2. Mitosis is also the source of
new cells when a multicellular
organism grows and develops.
D. As you remember, a cell spends most of its time in
Interphase. During interphase, a cell does its normal
job, grows larger, copies its DNA, and prepares for cell
division.
DRAW THIS!
III. Mitosis
A. Biologists divide
the events of
mitosis into 4
phases: prophase,
metaphase,
anaphase, and
telophase (PMAT).
During prophase, the chromosomes become visible, the
centrioles separate to opposite sides of the cell, the
chromosomes attach to the spindle, the nucleolus disappears,
and the nuclear envelope breaks down.
DRAW THIS!
B. The centrioles are two
tiny structures located in the
cytoplasm near the nuclear
envelope that help organize
the spindle.
C. The spindle fibers are a
fanlike microtubule structure
that helps separate the
chromosomes.
During metaphase, the
chromosomes line up across
the center of the cell (Middle).
During anaphase, the
centromeres that join the
sister chromatids split and the
chromosomes move until they
have separated into two
groups near the poles of the
spindle (Away).
DRAW THIS!
During telophase, the chromosomes begin to disperse
into a tangle of dense material, the nuclear envelope
reforms around each cluster of chromosomes, the
spindle breaks apart, and the nucleolus becomes visible
in each nucleus.
DRAW THIS!
Always remember…
P
Prophase
M
Metaphase
A
Anaphase
T
Telophase
D. Cell division is not complete after telophase.
Cytokinesis is division of the cytoplasm.
PG 58
Cell Cycle Foldable
Create a foldable explaining the different
phases of the cell cycle.
•Concrete Spellings
•Be creative in the representation of the
phases.
•Must include a minimum of 5 colors
•Will be due in the tray on Thursday
Small Group CHAMPS
In animal cells, cytokinesis occurs when the cell membrane is drawn
inward until the cytoplasm is pinched into two equal parts.
In plant cells, cytokinesis occurs when a cell plate forms cleavage furrow
between the divided nuclei gradually developing into a separating
membrane.
Mitosis in the Cell
Let’s practice…
• On the back of your page, number 1-5.
• On the next slide, you will see 5 pictures.
• You need to figure out what phase each one is in and write it down.
1
2
4
3
5
Collect Today
Page 56 – Interphase Handout
Assigned
Buff Binder Quiz #1 Makeup – (Today)
T/T Quiz Makeup – (Wednesday)
Cell Cycle/Vocabulary Quiz – (Thursday)
Page 58 – Cell Cycle Foldable (Thursday)
Late
Page 53 - Codon Face Project (-50%)