1. DNA: The Molecule of Heredity

2. Where can we find DNA? DNA up close! chromosome cell nucleus
Double stranded DNA molecule
DNA up close!
Individual Nucleotides

3. Messages from the inside?
DNA (Deoxyribonucleic Acid) is the genetic information of all living organisms stored in units called genes
A gene is a sequence of DNA that codes for a protein
These proteins make up our traits!!!

4. Traits
Our traits (genes) are inherited by our ancestors, but how do those traits tell our bodies to look the way we look? It’s a code!
(Like the Braille activity we did!) = CODE

5. Rosalind Franklin
Took x-ray of what is now known as the DNA double helix
Shared the Nobel Prize for aiding in discovery of the double helix of DNA

6. Watson & Crick = double helix
Using the information found by Franklin, Watson & Crick developed the double helix model of DNA in 1953
The double helix consists of a backbone made of sugars and phosphates and alternating bases called nucleotides

8. Nucleotides A nucleotide is the monomer of DNA
Nucleotides are small molecules made up of three parts
A sugar - deoxyribose
A phosphate group
A nitrogenous group

9. DNA’s Four Nucleotides
Adenine (A)
Guanine (G)
Cytosine (C)
Thymine (T)
Phosphate group
Deoxyribose

10. Base Pairing Adenine always binds with Thymine (A-T)
Cytosine always binds with Guanine (C-G)

11. Rungs of the Ladder are pairs of nitrogenous bases
This is one example of the ladder being “untwisted”
and how the bases are paired together

12. Let’s put it all together!
Nucleotide
Hydrogen bonds
Sugar-phosphate backbone
Key
Adenine (A)
Thymine (T)
Cytosine (C)
Guanine (G)