An official website of the United States government
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
In studies of genetic diversity of bristlecone pines, molecular markers allow unique specimens or populations of trees to be identified. Here, geneticist Chris Richards loads an automated DNA sequencer for genetic analysis.