Y-STR markers are useful when multiple males are involved in a sexual assault. If three men are involved in such an attack the investigators would expect Y-STR analysis to show a maximum of:

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Y-STR markers are specific to the Y chromosome, which is passed from father to son. In a case involving three men, Y-STR analysis would show a maximum of three peaks, one for each man's Y chromosome profile, assuming each man has a distinct Y-STR profile.

Y-STR Markers Are Useful When Multiple Males Are Involved in a Sexual