0:02 Sometimes an evidence sample might contain a  large amount of material from one DNA source  

0:07 and only a little from another. Consider in this  display two known samples: one is a male shown  

0:14 in the top electropherogram the fact that he is  male is apparent by the two green peaks visible  

0:20 at the left representing an X and a Y allele; the  other known sample is a female shown in the bottom  

0:27 electropherogram. Her electropherogram displays  only one tall green peak at the left representing  

0:34 her two X alleles. The center electropherogram is  that of the evidence sample. Note that every peak  

0:41 in the evidence samples electropherogram matches  to a peak from the electropherogram of one of  

0:47 the two known samples, indicating that those  individuals could not be excluded as being the  

0:52 two contributing sources of the DNA found in the  evidence sample. Notice also that the peaks in the  

0:59 evidence samples electropherogram that correspond  to those from the females electropherogram are not  

1:05 as tall as those that match the male. This means  that more of the male's DNA than of the females  

1:11 was present in the evidence sample. The male  therefore would be referred to as the major  

1:17 contributor to the evidence sample and the female  would be referred to as the minor contributor.