MODERN GENETICSThe Genetic Code

DNAWhat are genes? (4 min)

How many chromosomes are found in a normal human body cell?

DNADNA   is a complex molecule (polymer) found in all living things. The 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

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.

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.

Chromosome:Chromosome:         a coiled, double rod-shaped form of condensed

DNA that forms during cell division.

LAB: DNA ExtractionIntroduction

Read handout

Write outline of procedure

Perform lab

Answer questions

Goal of lab:

Outline of Procedure:

Answer to questions:

Title: Lab: DNA Extraction Date: September 29, 2010

Summary:

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

Guide Questions:

Procedure: 1. Why did we need to add detergent?

2. Why did we need to add alcohol?____________________________________________________________

1. Which of the following do you think will contain DNA? Explain your reasoning. bananas __ concrete __ fossils __ meat __ metal __ spinach __ strawberries __ fire__

2. What does DNA stand for?

3. Where do you find DNA?

4. What are the 4 nitrogenous bases found in DNA?