Crime lab science final essay


Please upload the final examination essay questions here.

1.  Why is Y chromosome STR analysis sometimes used in sexual assault  cases?  Can the Y-STR analysis be used to show that a suspect is a  “match” for a particular sample?  

 2.  What is touch DNA?  When would it be used? What are the  limitations and drawbacks of its use?  (Use two outside sources for your  response and cite using APA format).


3.   Describe the CODIS system and its use in detail. Include a discussion of databases, indexes and tiers.

 4. There was a major case of suspected child abuse in Texas that in  2009 that was highly publicized.   One of the issues in the case is that  mothers and fathers of the children have not been able to be determined  since the parents will not divulge the information.  As a result of  this, the courts ordered DNA tests on all parents and children.


The mother had genotype 8,12 and the father had genotype 11,12. Two  children were tested and had the following genotypes: Child A- 8,12 and  Child B- 8,9.

a) Is child B the son of the father?  Explain your reasoning in terms of the combined paternity index.

b) If A and B had children together what would be their possible genotypes for the genetic locus studied here?  

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