1. Read the Lab in front of you Answer these question in your lab book, I will come around to check (THIS IS NOT YOUR DOW) ANSWERS found on the lab sheet 1. Why do scientist study DNA? 2. Pulverize means to pound or crush into powder. How should the banana look after you complete step one. 3. The word spool is used in the procedures, using context clues, what do spool mean?

2. Extract DNA Key Terms DNA: Deoxyribonucleic acid, which is the hereditary material in cells that contains the instructions for producing the cell and enabling it to function Extraction: A procedure to obtain a substance by chemical or mechanical action Filtrate: The material collected after a solution or mixture passes through a filter Precipitate: Solid material that comes out of solution as a result of a chemical or physical change

3. OBJECTIVE: STUDENTS WILL EXPLAIN HOW CRIME SCENE EVIDENCE IS PROCESSED TO OBTAIN DNA. phone theft incidents= no more charging phones in class….if I see it its mine ;) Do Now 1.Finish your post lab paragraph DNA stands for _________________. The DNA is found on the ______ which is found in the nucleus of cells. The backbone of DNA is made up of alternating _______ and _______ groups. The ____ on my model represents the backbone of DNA. The 4 nitrogen bases are ______, ________, __________, and ______. The _______ on my model represents the nitrogen bases. Adenine always pairs with _______. ________ always pairs with _________. The nitrogen bases are held together by a weak _____ bond. The three molecules that make up a nucleotide are _______, ________, and ________. 2. What did the following materials represent in DNA The Different colored Twizzlers represents the _____ in DNA The Marshmallows represents the _____ in DNA The Toothpicks represents the _____ in DNA 3. Update your tracker (√ = 100) 4. Read the lab procedures and answer pre-lab questions

4. Exit ticket 1.Name the four bases that pair together DNA? 2.The backbone of DNA is made up of what two molecules? 3.What are the two functions of DNA?

5. Where can DNA evidence be located? How is DNA evidence related to Locard’s Exchange Principle? Located in blood saliva semen root of hair bone tooth – odontology urine B.S. Burst

7. Exit Ticket 1. Where can DNA be located on a crime scene? 2. How do you collect DNA 3. What are the two functions of DNA?