DNA
- Created by: meganjayne15
- Created on: 01-05-14 19:40
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- DNA
- what is it?
- contains all genetic information for an individual
- in every cell of the body expect red blood cells
- two types of DNA
- nuclear
- mitochondrial
- organised into 23 pairs of chromosome
- male - xy
- female - **
- 8 hours to get DNA profile
- bp = basepair
- STR = short tandem repeats
- contains all genetic information for an individual
- why?
- identify suspect or victim
- exclude individuals
- evidence dependant
- DNA databases
- present at crime scene in many forms
- statistics available
- level of evidence
- sub source
- whos DNA is it?
- source
- what is the source of DNA?
- activity
- how did it get there?
- be cautious
- how did it get there?
- offence
- is the action an offence?
- do not state level of offence!
- Example
- be cautious
- source
- what is the source of DNA?
- sub source
- whos DNA is it?
- sub source Joe Bloggs - source semen from high vaginal swab activity - sexual activity present
- Example
- do not state level of offence!
- is the action an offence?
- sub source
- prior to DNA profiling
- blood groups were used
- type O, A, B and AB
- limitations
- litre of blood needed
- discrimination difficult
- bone marrow transplants
- DNA fingerprinting
- relies on probe designed to bind to the repetitive sequence
- issues
- long process
- analysis time up to 8 weeks
- complicated
- blood groups were used
- what is it?
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