Download DNA

Bell ringer
1.
2.
3.
What is the difference between haploid
and diploid cells?
What are 3 differences between mitosis
and meiosis?
What is the cellular division of prokaryotic
cells called?
When done with bellringer, get your textbook
DNA and Chromosomes
Essential Question:
What are some reasons for scientists to
study the DNA?
Cells and DNA
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All organisms are made of one or more
cells
With few exceptions, all cells contain DNA
All organisms have DNA
DNA
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DNA is basically a long molecule that contains coded
instructions for the cells.
Everything the cells do is coded somehow in DNA which cells should grow and when, which cells
should die and when, which cells should make hair
and what color it should be.
Our DNA is inherited from our parents. We resemble
our parents simply because our bodies were formed
using DNA to guide the process - the DNA we
inherited from them.
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DNA is a long molecule, like a chain, where the links
of the chain are pieces called nucleotides
(sometimes also called 'bases').
DNA has two sides, or strands, and these strands
are twisted together like a twisted ladder -- the
double helix.
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The sides of the ladder are made of sugarphosphate portions of nucleotides bonded
together.
There are four different types of nucleotides
in DNA which we'll call Adenine, Guanine,
Cytosine, Thiamine: 'A', 'G', 'C' and 'T'.
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These four are all that's necessary to write a code
that describes our entire body plan.
Adenine (A) and Thiamine (T) always
come in pairs and Guanine (G) and
Cytosine (C) always come in pairs
What is the relationship between
DNA and chromosomes?
 DNA is found in all
living things and
carries the
instructions of cells.
 A single DNA strand
holds the information
to build many
different proteins
What is the relationship between
DNA and chromosomes?
2. Chromosomes are
strands of DNA that
are coiled up – A
chromosome holds
the information to
build many different
proteins
Why does DNA exist in two forms?
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The DNA instructions can only be “read” and
copied when the strand is unwound
During cell division, the copied DNA must be
sorted and separated into two new cells - In
order to prevent the strands from getting
tangled and damaged during cell division,
they are wound into chromosomes
Analogy

Chromosomes are like
phone books because
chromosomes have
many genes just like
phone books have
many phone numbers
Analogy

Genes are like phone
numbers because
genes hold the
information to build 1
specific protein just
like phone numbers
hold the information
to call 1 specific place
352-978-2406
Mrs. Miller

DNA Structure INB pg. 52

Textbook pg. 105:
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Cut out DNA picture from textbook pg. 105
Label the side of the ladder
Label the four nucleotides or bases
Write a paragraph to describe DNA
DNA
(sugar-phosphate)
DNA Video Clip
Choose one of the followings:
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Sequence 1: T A C G T A T G A A A C
Sequence 2: T G G T T T A G A A T T
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Materials
-
red color – twisted ladder
yellow – steps of the ladder
green - represent adenine
pink - represent thymine
yellow - represent guanine
blue - represent cytosine
Instructions:
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Choose a different color to represent each of
the chemicals. Using coloring pencils, assign
colors to each of the bases.
When you are finished, label each of the
chemicals bases. (Adenine (A) and Thymine
(T) always come in pairs and Guanine (G) and
Cytosine (C) always come in pairs)
Create a Key
Summary – Answer essential question and also
explain your DNA drawing
Bell ringer
1.
2.
3.
4.
5.
What is DNA?
Where is DNA located?
What is the side of the DNA ladder or
strand made up of?
What are the 4 DNA nucleotides?
What is the shape of DNA?
*When done w bell ringer, complete Cornell
notes on INB pg. 53 including the summary
Semester Exam Day
Procedure:
1.
Find your seat as you would be seating as an “U shape.
2.
Place your cell phone (turned off) inside the cell phone purple
container
3.
Materials on your desk: pen or pencil, a blank sheet of paper,
your answer sheet, and your exam
4.
Respect others when done with exam, they need the same
quite environment you were privileged to enjoy.
One more time, thank you for a wonderful semester filled with
great learning and respect with one another; I hope you had
enjoyed it as much as I have.
Have a resting/safe winter break. Happy Holidays to everyone!
Love,
Mrs. Miller