Non-Human DNA
- Created by: AAntonianannetti
- Created on: 13-05-19 10:34
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- Non-Human DNA
- Why might non-human DNA testing be used?
- Crimes against animals
- cruelty to animals
- Transfer of hair may help to provide evidence of allegations
- cruelty to animals
- Crimes against people or property
- Hair transferred by animals can be transferred
- Can help to identify species
- Help link people to crime scenes
- Can help to identify species
- Hair transferred by animals can be transferred
- Possession of protected animals
- Number of animals endangered and protected under legislations
- Crimes against animals
- Example
- Leanne Tiernan
- in 2001, Leanne's body was found buried in a shallow graven with a black plastic bag over her head help in place by a dog collar.
- Dog hairs were found on Leanne's body
- Scientists were able to produce a partial DNA profile
- However, the suspects dog had since died so evidence could not beused
- Scientists were able to produce a partial DNA profile
- Dog hairs were found on Leanne's body
- First time a British murder investigation had used dog DNA profiling
- in 2001, Leanne's body was found buried in a shallow graven with a black plastic bag over her head help in place by a dog collar.
- Leanne Tiernan
- Non-Human DNA analysis
- Due to shed hair often not containing roots, nuclear DNA may not be present
- Mitochondrial DNA may be more viable
- Species Identification
- the locus of choice must have little variation, such that all members of the same species have the same DNA type
- the locus of choice must have sufficient interspecies variation such that members of one species can be separated from members of the next closely related species
- Process
- 2) The product is sequenced and the DNA sequence is compared to those on the DNA database
- If there is an 100% match from a registered species, and the next closest has a homology of 95%, then there is every reason to believe that the unknown material is from the species that it matches to
- 1) DNA is isolated from the unknown material and amplification primers are use to produce a {CR product of around 400bp in length
- 2) The product is sequenced and the DNA sequence is compared to those on the DNA database
- Due to shed hair often not containing roots, nuclear DNA may not be present
- Why might non-human DNA testing be used?
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