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.
