The document discusses DNA and genetics. It explains that DNA stores and transmits genetic information that tells cells which proteins to make. It also describes the DNA double helix structure discovered by Watson and Crick. Additionally, it provides some context about the size of DNA and cells.

1. MODERN GENETICS The Genetic Code

3. D N A What are genes? (4 min)

4. How many chromosomes are found in a normal human body cell? DNA is a complex molecule (polymer) found in all living things. T he primary function of DNA is to store and transmit genetic information that tells cells which proteins to make and when to make them. http:// www.dnalc.org/home.html

5. In 1953, James Watson and Francis Crick proposed a model for the DNA molecule that consisted of two nucleotide chains that wrap around each other to form a double spiral. This shape is called a double helix .

6. An idea about size: An average cell nucleus is about 6 micrometers in diameter. The total length of the DNA in the human genome is 1.8 meters . There must be several levels of coiling and supercoiling in DNA .

7. Chromosome: a coiled, double rod-shaped form of condensed DNA that forms during cell division.

8. LAB: DNA Extraction Introduction Read handout Write outline of procedure Perform lab Answer questions

10. Title: Lab: DNA Extraction Date: September 29, 2010 Summary: Goal of lab: Outline of Procedure: Answer to questions:

12. General Steps: 1 Collect cells from cheek using Gatorade 2 Separate parts of the cell using detergent . 3 Add alcohol to make the clumps of DNA (chromosomes) float