11/16 & 11/17 - 7th Grade Agenda
Collect HW: Reading & Note Taking p.75
- 78
Cell Division
Brain Pop Cell Division
Cell Cycle Quiz
Microviewer Lab (Cell Structures)
Class Reading p.133-136
HW: Reading & Note Taking p.79 – 80
Reflection
• Prompt: What is the Cell Cycle and name
2 phases in the Cell Cycle.
Mitosis Animations & Movie
• http://www.cellsalive.com/mitosis.htm
• http://www.cellsalive.com/cell_cycle.htm
• http://www.pbs.org/wgbh/nova/baby/divide.
html#
• http://www.contexo.info/DNA_Basics/mitos
is%20movie.htm
Cell Cycle
?
Interphase
Prophase
?
?
Cytokinesis
Metaphase
Telophase
?
?
Anaphase
?
Interphase
• Stage 1: Interphase:
Period before cell
division occurs.
– Cell is doing its J___
ob
while growing (doubles
in size)
– Replicates (make a
copy) its DNA
Mitosis : Prophase
Prophase:
Identical Chromatids
air up They are
p______.
held together by a
centromere
Mitosis : Metaphase
Metaphase:
Chromosomes line
up in the m______
iddle
Mitosis : Anaphase
Anaphase: The
centromeres split
and the
chromosomes are
pulled a______
part
Mitosis: Telophase
Telophase:
Each set of
chromosomes
ar away
are F___
and a nucleus
forms around
them
Cytokinesis
Cytokinesis
The cell membrane
m______
oves inwards then
pinches in two. This
form 2 identical cells
DNA – Deoxyribonucleic Acid
• Nitrogen Based
Molecules (4 Letters
of DNA Alphabet)
T
• A pairs up with ____
C
• G pairs up with ____
Cell Cycle
• Stage 1: Interphase:
Period before cell
division occurs.
–Cell doubles in
size
–Copy the DNA in
its nucleus
Cell Cycle
• Stage 2: Mitosis
–One copy of
the DNA is
distributed into
each of the two
daughter cells
Cell Cycle
• Stage 3: Cytokinesis
–Cytoplasm divides
Cell Cycle Facts
• Some cells divides every 2 hours or less
• Human Liver cells divides every 22 hours
• There are about 100
_____ million cells
dividing in your body right now!!
rain cells
• Most cells divide but human b_____
never divide.
Cell Cycle Facts
• Some cells divides
every 2 hours or less
• Human Liver cells
divides every 22
hours
• There are about 100
million cells dividing
in your body right
now!!
• Most cells divide but
human brain cells
never divide.
Chromosomes
DNA Replication
• DNA looks like a spiral
staircase “double helix”
• Two sides of DNA ladder
are made up of sugar
called deoxyribose and
Phosphate
• Adenine always pairs with
Thymine
• Cytosine always pairs
with Guanine
Cancer
• What is Cancer
Mutation:
Damage to the
DNA
Cancer
• Cancer begins when mu________
tation
disrupt the normal cell cycle causing
cells to di_________
in an
vide
uncontrolled way
mor (a mass of
• Eventually a tu______
abnormal cells) forms.
How Cancer Spreads
Treating Cancer
• Surgery: Only
effective during early
stages
• Radiation: Radiation
also destroy healthy
cells
• Chemotherapy: Uses
of drugs to kill cancer
cells. Side effect:
Also kills healthy
cells.
Cancer Prevention
• 2/3 of all cancer
deaths are caused by
tobacco use or
unhealthful diets
• Smoking is the main
cause of lung cancer
Cancer Prevention
• Diet high in fat (fatty
meats, fried foods) is
harmful
• Diet that includes a lot
of fruits, vegetables
and grain products
can lower some type
of cancer.
Cell Cycle Quiz: Groups of 3 students
p.132 & 133
Front of the card
Back of the card
Name of the Phase:
Mitosis: Prophase
Summary of the Phase:
Spindle Fiber, Centromere &
Chromatids form.
1. Each student will create 2 cards
2. The group will combine their cards to complete the
cell cycle
3. Students in each group will quiz each other with their
flash cards
4. Apprentices will come around and quiz and grade each
of the group