A SNP is a variation of a single nucleotide between individuals. These polymorphisms can therefore be used to discern small differences both within a population and among different populations.
President of the United States. The President of the United States is the head of state of the U.S., the chief executive of the federal government, and Commander-in-Chief of the armed forces. The United States was the first nation to create the office of President as the head of state in a modern republic.
John Tyler was the United States of America s tenth president. President John Tyler was born in Charles City County, Virginia on March 29, 1790 and grew up to become America s tenth president. He was a lawyer before he became President of the United States at age 51.