1. DNA & Chromosomes

2. DNA Model DNA can be compared to a ladder that is twisted into a continuous spiral shape known as a double helix Each step contains pairs of chemicals Adenine and Thymine pair together Guanine and Cytosine pair together http://learn.genetics.utah.edu/content/begin/traits/t our_chromosome.html http://learn.genetics.utah.edu/content/begin/traits/t our_chromosome.html

3. Gene A gene is thought to be a interrupted segment of DNA that contains coded instructions for specific traits. Genes come in pairs and each possible version of a gene is called a allele

4. Videos Heredity http://learn.genetics.utah.edu/content/begin/ traits/tour_heredity.html http://learn.genetics.utah.edu/content/begin/ traits/tour_heredity.html Traits http://learn.genetics.utah.edu/content/begin/ traits/tour_trait.html http://learn.genetics.utah.edu/content/begin/ traits/tour_trait.html