Biology - High School


Table Of Contents: Genes

1. Function of a Gene
Each gene along a strand of DNA has the information to tell the cell to produce a specific protein.
2. DNA Sequence
A gene is made up of a particular sequence of DNA bases. This sequence acts as a code for a protein.
3. What Is a Trait?
The production of different proteins determines the traits of an organism. A trait is an inherited characteristic.
4. Alleles
Genes that exist in alternate forms are called alleles. The gene that determines earlobe shape exists in two alleles—one results in an attached earlobe and the other a free earlobe.
5. Multiple Alleles
Some genes have more than two, or multiple alleles. The human ABO blood group gene has three alleles that can combine to four types of blood groups.