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Related Experiment Video

Updated: May 27, 2026

Shifting Zebrafish Lethal Skeletal Mutant Penetrance by Progeny Testing

Shifting Zebrafish Lethal Skeletal Mutant Penetrance by Progeny Testing

Published on: September 1, 2017

Match probabilities for multiple siblings.

¹Netherlands Forensic Institute, P.O. Box 24044, 2490 AA The Hague, The Netherlands. k.slooten@nfi.minjus.nl

Forensic Science International. Genetics

|November 18, 2011

Summary

When a defendant has multiple brothers, the probability of at least one brother matching a crime stain DNA profile is less than n times the individual match probability (p). This provides a simpler, conservative estimate for legal cases.

Area of Science:

Forensic Science
Genetics
Probability Theory

Background:

Criminal defendants may present alternative suspects, such as brothers, to explain DNA evidence.
Accurate statistical interpretation of DNA evidence is crucial in legal proceedings.
Estimating the probability of a DNA match within a group of related individuals presents a challenge.

Purpose of the Study:

To mathematically evaluate the probability of a DNA profile match when multiple brothers are considered as potential sources of a crime stain.
To establish a simplified and conservative statistical measure for such scenarios in forensic casework.

Main Methods:

Utilized probability theory to model the likelihood of a DNA profile match among 'n' brothers.
Calculated the probability of at least one brother matching the crime stain profile.

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Compared this probability to a simpler upper bound, 'np'.

Main Results:

Demonstrated that the probability of at least one brother matching the crime stain is strictly less than the product of the number of brothers ('n') and the individual match probability ('p').
The quantity 'np' serves as a conservative and easily computable upper bound for the true probability.

Conclusions:

The study provides a statistically sound and simplified method for assessing DNA evidence in cases involving multiple potential suspects within a family.
Reporting 'np' offers a conservative estimate that is less likely to overstate the significance of a DNA match, aiding in legal decision-making.