miniPCR bio™ Electrophoresis Forensics Lab. Wrongfully Convicted? Instructor's and Student's Guide
Version: 1.1 - Release February 2022 - © 2022 by miniPCR bio™
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Study questions
1. D7S820 can have between 5 and 16 short tandem repeats.
A. What is the maximum number of alleles possible for this STR?
B. What is the maximum number of genotypes for D7S820 where both alleles contain the
same number of repeats?
C. There are 66 genotypes for D7S820 where the two alleles do not contain the same
number of repeats. Give two different examples of such genotypes.
