Genome.gov

The National Human Genome Research Institute (NHGRI) created the Talking Glossary of Genetic Terms to help everyone understand the terms and concepts used in genetic research. In addition to definitions, specialists in the field of genetics share their descriptions of terms, and many terms include images, animation and links to related terms.

There is even a glossary in Spanish.

They provide a comprehensive dictionary of genetic terms that may assist you when using our "How-to Guides" and "Additional Resources," or when doing searches of your own.