SNP genotyping is the measurement of genetic variations of single nucleotide polymorphisms (SNPs) between members of a species. It is a form of genotyping, which is the measurement of more general genetic variation.
On most plays, the center will snap the ball directly into the quarterback's hands. In a shotgun formation, the center snaps the ball to the quarterback lined up several yards behind him.
While only the quarterback, the wide receivers and tight ends, and the running backs can legally handle the ball, it is the quarterback who is the leader of the team and the playmaker. In fact, he's a man of many talents - he not only throws the ball, he outlines each play to his team.