1. DNA BARCODING GATAATGCTGACAACGCCGATAATGCAGACAACGCGGATAATG

2. How do we know what we are eating?

3. Red Snapper is on the Menu

4. But Red Snapper is from the Atlantic or the Gulf of Mexico…

5. Steve Palumbi is from Monterey

6. Turn On the Lights!

7. Building Blocks of DNA

8. The Two Strands of DNA Pair Very Precisely

9. Only One Strand is Written Scientists only bother to write the sequence of letters for one strand. Because… if you know one strand, then you can figure out the other. This DNA sequence is G-T-C-A

10. DNA Sequences are Different for Different Species A sequence such as: ATGCTGACAACGCCGATA codes information that gives cells instructions. That information is different for different species. If the species are closely related, then the information is similar. If the species are not closely related, then the information is more different. Therefore, the sequences of closely related organisms are also similar.

11. DNA Sequence Variation Human GTTGAAAAGGGAGGCAAGCACAAGACTGGGCCTCCATGGTCTC Chimp GTTGAAAAGGGAGGCAAGCACAAGATTGGGCCTCCATGGTCTT Rat GTGGAAAAAGGAGGCAAGCATAAGACTGGACCTCCATGGTCTG Fish GTAGAGCAGGGCGGGAAGCATAAAACCGGCCCTGTGGGGGCTG

12. Shortbelly Rockfish Pacific Ocean Perch Red Snapper

13. Shortbelly Rockfish Pacific Ocean Perch Red Snapper

14. Shortbelly Rockfish Pacific Ocean Perch Red Snapper GTGATGAAACTTCGGCTGTCTCTTAGGACTCTGC GTGATGAAACTTCGCGTCTCTCTTAGGACTCTGC ATGGTGAAACTTTGGCTCTCTACTTGGCCTTTGC

15. Next Task…Is This DNA Human? ATGGTGCACTGGTCCGCCGAGGAGAAGCAGCTCATCACCAGCGTCT GGAGCAAAGTCAACGTGGAGGAATGCGGTGCCGAAGCCCTGGCCAG GCTGCTGATCGTCTACCCCTGGACCCAGAGGTTTTTTGCCTCCTTT GGGAACCTCTCCAGCCCCACCGCCATCATGGGCAACCCCAGGGTCC GTGCTCATGGTAAGAAAGTGCTGAGCTCCTTTGGGGAAGCCGTGAA GAACCTGGACAACATCAAGAACACCTACGCCAAGCTGTCGGAGCTG CACTGCGACAAGTTGCACGTGGACCCCGAGAACTTCAGGCTCCTTG GGGACATCCTGATCATCGTCCTGGCCTCCCACTTTGCCAGGGATTT CACTCCTGCCTGCCAATTTGCCTGGCAGAAGCTGGTCAACGTTGTG GCTCATGCTCTGGCCCGCAAGTACCACTGA