DNA structure lesson
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Transcript of DNA structure lesson
New Seating Chart
Semester 2 PreviewGenetics
◦DNA◦Gene expression
and protein synthesis
◦Mutations◦Creation of sex
cells (gametes)◦ Inheritance of traits◦biotechnology
Evolution◦Gene pools◦Sources of variation◦Natural selection◦Evidence for evolution◦Adaptations◦Human impacts on
gene pools
• Classification of life– Kingdom Animalia
• Nervous systems– Kingdom Plantae
• Vascular systems• Plant reproduction
https://www.youtube.com/watch?v=EzEr23XJwFY
https://www.twig-world.com/film/genetic-modification-1063/
So what is a GMO and why are they controversial?
Quick CheckWhere is the DNA in a
eukaryotic cell?
1-4-17 Objective
create a model of a DNA molecule and correctly identify each component
As always…
Key concepts are underlined
Vocab is in green
DNA
Structure
Big Idea # 1 DNA is a type of
nucleic acid made up of repeating units called nucleotides
1 nucleotide
Remember…
Nucleotides are like building blocks
A long chain stacked together makes a DNA molecule
Like 1 nucleotide
Many nucleotides linked together = DNA
Big Idea # 2
Nucleotides are made up of 3 parts
1. sugar called deoxyribose2. phosphate group3. nitrogen base
Deoxyribose
Draw along with me in your notebook
Quick CheckWhat observations can you make about this model of DNA?
The deoxyribose sugar and the phosphate are ALWAYS THE SAME
There are 4 KINDS of nitrogen bases:– Adenine (A)– Guanine (G)– Cytosine (C)– Thymine (T)
but…
Quick Check
In your notebook
Draw an ADENINE NUCLEOTIDE pairing with the one you already drew
Big Idea #3
In DNA:– A always pairs with T – C always pairs with G
A and T form 2 hydrogen bonds between them
C and G form 3 hydrogen bonds between them
Quick CheckWhat observations can you
make about the 4 nitrogen bases in DNA?
Big idea #4
DNA is a double helix
Double - 2 strands Helix - twisted
The 2 strands of DNA are COMPLIMENTARY to each other
For your assignment: Color the sugar deoxyribose BLUE Color the phosphate group PURPLE Color the Adenine RED Color the Thymine YELLOW Color the Cytosine ORANGE Color the Guanine GREEN
Answer the questions on a piece of binder paper and build the molecule
When you are done, bring your molecule to the wall and join it to the others