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Random match probability can be calculated in mixtures that involve two contributors and one contributor is known. For example, in sexual assault cases a vaginal swab is analyzed for the presence of semen and a DNA profile is developed from the sperm fraction and non-sperm fractions.
In some cases, as mentioned above, the sperm fraction results in a mixed sample that is consistent with the victim and the sperm donor. If the mixture reveals four alleles - 14, 15, 16, and 17 - and the victim is known to contribute the 14 and 15 alleles, it can be inferred that the sperm donor must be responsible for the 16 and 17 alleles.
Additional Online Courses
- What Every First Responding Officer Should Know About DNA Evidence
- Collecting DNA Evidence at Property Crime Scenes
- DNA – A Prosecutor’s Practice Notebook
- Crime Scene and DNA Basics
- Laboratory Safety Programs
- DNA Amplification
- Population Genetics and Statistics
- Non-STR DNA Markers: SNPs, Y-STRs, LCN and mtDNA
- Firearms Examiner Training
- Forensic DNA Education for Law Enforcement Decisionmakers
- What Every Investigator and Evidence Technician Should Know About DNA Evidence
- Principles of Forensic DNA for Officers of the Court
- Law 101: Legal Guide for the Forensic Expert
- Laboratory Orientation and Testing of Body Fluids and Tissues
- DNA Extraction and Quantitation
- STR Data Analysis and Interpretation
- Communication Skills, Report Writing, and Courtroom Testimony
- Español for Law Enforcement
- Amplified DNA Product Separation for Forensic Analysts