Cell Reproduction

1
Chapter 3 Cell Reproduction Section 2 DNA
2

• DNA
• What is it?
• 1. DNA deoxyribonucleic acid
• 2. hereditary material (passed
• from parents to offspring)

3
3. a set of master instructions OR a
road map for your cells 4. a section of DNA
is called a gene
4
-these sections of DNA or genes, tell
your cells exactly what to do -they determine
your traits
5
Image from U.S. Department of Energy Human
Genome Program / www.howstuffworks.com
6
5. DNA is what makes you, YOU
DNA
Here are the master instructions for YOU!
7
B. Location of DNA 1. DNA is found inside
the nucleus 2. coils and twists to form your
chromosomes
8
Chromosome
made of coiled, twisted DNA
9

• Structure of DNA
• 1. model created by Watson and
• Crick
• 2. 2 long, thin chains connected to
• one another

10
3. looks like a twisted ladder called a
double helix
"double helix"
11

4. formed of nucleotides a. nucleotides
made of 3 parts (sugar, phosphate
nitrogen base) 1) sugar
phosphate sides 2) nitrogen bases
rungs
12
4 Nitrogen Bases ?Adenine (A) ?Thymine
(T) ?Guanine (G) ?Cytosine (C) A
pairs with T. C pairs with G.
13
www.howstuffworks.com
14
cell nucleus
sugar and phosphate
nitrogen bases (A-T) (C-G)



Cell/DNA - http//www.accessexcellence.org/AB/GG/s
tructure.html
15
D. Replication of DNA 1. process by which
DNA makes copies of itself
(like a copy machine) 2. unzips (base pairs
separate) and new base pairs join

16
DNA Replication
Click on the link below for an animated look at
DNA replication. http//www.lewport.wnyric.org/jwa
namaker/animations/DNA20Replication20-20long20
.html
17
E. DNA Research 1. DNA found in every
cell 2. recombinant DNA DNA formed
when DNA from 2 or more sources is
combined
18
3. created artificially 4. used to
manufacture products that help
treat many health conditions 5. used for gene
therapy in humans
19
examples of recombinant DNA or genetic
engineering ?bacteria that can produce
insulin ? plants more resistant to spoilage,
chemicals to treat weeds, insect attacks, frost
20
(No Transcript)
21
And thats just the beginning!