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.
A player position on offense. He is split wide (usually about 10 yards) from the formation and plays on the line of scrimmage as a split end (X) or one yard off as a flanker (Z). The offensive-formation rules regarding the number of backs and linemen are still used.