DNA fingerprint.
<P>
   This  gel shows that DNA in blood from the defendant's clothes matches
   the  DNA  fingerprint  of  the  victim  but  differs  from that of the
   defendant.
<P>
   This  is  evidence that the blood on the defendant's clothes came from
   the victim, not the defendant.
<P>
<BR><LI> How can DNA samples from a crime scene be amplified to have enough
DNA for fingerprinting?
<li> Use PCR.
Exercise:  <A ClAsS=ACT Href="http://media.pearsoncmg.com/bc/bc_campbell_biology_7/media/activities/load.html?20&amp;G" oNClick="popact('http://media.pearsoncmg.com/bc/bc_campbell_biology_7/media/activities/load.html?20&amp;G');txtcolor('fingerprint2','gray');return false;" Id=fingerprint2><iMg sRc="/images/tutorial.gif" aLt='' boRDer=0></A>