Humans shed approximately 100 strands of hair per day Often found as forensic evidence A single strand of hair can holds many pieces of information Species.

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Presentation transcript:

Humans shed approximately 100 strands of hair per day Often found as forensic evidence A single strand of hair can holds many pieces of information Species Ethnicity Part of body Chemicals DNA (?) This information is usually considered circumstantial or indirect Can be used to narrow suspects

Hair is Made of Keratin Simplified parts: Root/follicle Shaft Tip DNA is found in the root/follicle only

Cuticle Transparent outer covering Acts as protective layer Holds in moisture Shows damage Seen as a layer of scales Shape of scales varies by species

Cortex Main body that gives hair its shape Contains the pigment

Medulla Core of cells that runs down the center of the cortex Human: 4 Groups Absent Trace (fragmentary) Broken (discontinuous) Continuous Other mammals: Are more prominent and have distinct shapes