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.
Donald Miralle/Getty Images. The safety position, or free safety, is the last line of defense in the secondary on a football team. He is the deepest defender on a pass play, and provides secondary support on a run play.