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.
The safety position has two functions on the football field, which coincide with the two distinct safety positions. The two positions, free safety and strong safety, have roles that sound exactly like their names suggest.