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.
Part 1. 1  1. Keep your eyes on the ball at all times. A good way to stay zeroed on the ball is to watch the tip of the ball all the way from the quarterback's hand to yours, especially as you practice. 2  2. Extend your arms toward the ball as the ball approaches, so your hands meet it at the furthest possible point.