1 Parental testing-to establish if someone is the biological parent of a child. 2  Forensic testing-to help identify suspects or victims in a criminal investigation. 3  Gene therapy-to test parents or foetuses for genetic conditions or birth defects. 4  Genetic genealogy-to find out more about someone's ancestry.NA tests are sometimes the only evidence to prove that a suspect was involved in a crime, or free someone who has been wrongly convicted. It is easy to tell if DNA from two biological samples does not match. But a match doesn't make you totally certain that the two samples come from the same person.
Light switches can be used hundreds of times a year in a home. This constant use can loosen wire connections and eventually wear out the moving parts. Wiring a switch is an easy do it yourself project. Just make sure to turn off the power to the circuit you are working on. A single-pole switch is used to control lights from only one location. The switch has two screw terminals on the body of the switch. Most switches will also have a green grounding screw. A single-pole switch will have ON and OFF marked on the lever. A switch is just a break in the hot wire controlling a light.
DPST is short for double pole, single throw. Double pole means that the unit contains two identical switches, side by side, and operated by one single toggle or lever. This means that two separate input wires can be controlled by a flick of one toggle.