Unit 4-Physical Evidence: Hair, Blood, & Fingerprints Flashcards
Has there been a way found to individualize hair?
No, you can’t match hair to a particular person through its morphology.
Morphology
Hair’s form and structure.
Is hair different as we age, or on doc parts of the body?
Yes!!!
Where are hair sample generally taken from?
Head or pubic area.
How much hair is collected from the scalp?
50 strands of hair.
How much does hair grow each month?
1 inch
How much of the strand of hair should you collect?
Pull out at scalp/ skin line to see variation in colour/structure.
How do you determine if hair is human or animal?
Look for the presence or absence of a medulla.
Medulla
Set of cells that run through a hair.
Is DNA testing more accurate than microscope analysis?
Yes, in a study it was 10% more accurate.
Where do you extract Nuclear DNA from?
The follicular tissue and root of hair.
Nuclear DNA
Found in the nucleus of a cell and is inherited from both biological parents. Produces individualized results, harder procedure.
Mitochondrial DNA
Found in small structure outside the nucleus of a cell and is inherited from the biological mother. Only produces class characteristics, easier procedure.
Analysis of blood began when, and by who?
Began in 1901- Karl Landsteiner discovered the categorization of blood into types.
A-B-O System
Categorized the properties of blood into 3 different blood types.
