DNA & Chromosomes

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/tour_chromosome.html

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

Videos

Heredity• http://

learn.genetics.utah.edu/content/begin/traits/tour_heredity.html

Traits• http://

learn.genetics.utah.edu/content/begin/traits/tour_trait.html