President's DNA Initiative
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Allele Drop-Out

Home > STR Data Analysis & Interpretation > Data Troubleshooting > Allele Drop-Out

Allele drop-out occurs when a sample is typed and one or more alleles are not present.

This can be due to a variety of factors:  

image of allele degradation in an electropherogram

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© 2007 NFSTC Science Serving Justice®
NOTE TO USERS: The President’s DNA Initiative DNA Analyst Training program and assessment were completed and published in 2005, in cooperation with the National Institute of Justice. The science and techniques in the program are sound and proven, however, program content has not been updated to include tools and technologies developed and in use after 2005, including many kits and robots. Assessment questions address only content delivered in this program and may not contain the full range of tools in use in your laboratory.