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.
Beginner's Guide to Football. 1  The quarterback (QB) passes or hands off the ball. 2  The center snaps the ball to the QB and blocks the defense. 3  2 guards and 2 tackles keep the defense at bay. 4  2/4 wide receivers catch the ball thrown by the QB. 5  1 or 2 running backs take the ball and run with it.