Extension: Probability and DNA profiles
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?
Type your answer here.
b. What is the maximum number of genotypes for D7S820 where both
alleles contain the same number of repeats?
Type your answer here.
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.
Type your answer here.
Electrophoresis Forensics Lab: Wrongfully Convicted? Student E-worksheet™.
Release: September 2023. © 2023 by miniPCR bio
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