2.  DNA can be collected from any living tissue:  blood, skin, hair, urine, semen, sweat or tears

3. 1. DNA sample is inserted into a well of a gel.  Agar gel is used; agar is from seaweed and is electrically neutral 2. An electric current is passed through the gel and buffer solution  The negatively charged particles of the DNA move toward the positive electrode while the positive charge particles move toward the negative electrode.

4. 3. Shorter strands move farther down the gel as pieces of DNA separate & show up as bands 4. Gel or DNA is stained to make the bands more visible 5. Samples are compared to find a match

7.  DNA is negatively charged so it is attracted to the positive end of the gel.  The shorter DNA fragments move faster than the longer fragments.  DNA is separated on basis of size.

8. 1. Paternity & Maternity cases 2. Criminal investigations  DNA or other genetic evidence left at the scene of a crime can be compared 3. Personal identification  Missing person, remains of a body

9. Suspect #2- They are a match!

10. Suspect #1- They are a match!