Forensic Science Quiz: Hair and Fibers

Major constituents (means part of the whole) of hair

• 1. Keratin is a protein that makes up most of the hair shaft.

  2. Melanin is a pigment that gives hair its color. 3. Redheads have pheomelanin instead of melanin

• 1. Keratin is a pigment that gives hair its color.

  2. protein that makes up most of the hair shaft. 3. Melanin is a pigment that gives hair its color.

• Keratin and Melanin is a protein that makes up most of the hair shaft.

  pheomelanin instead of melanin.

• 1. Collagen is a pigment that gives hair its color.

  2. protein that makes up most of the hair shaft. 3. Melanin is a pigment that gives hair its color.

The structure of a hair can be compared to a number 2 pencil.

The cortex....

• is the main body of a hair (compared to the wooden portion of a pencil)

• is the central cell of the cortex (compared to the lead of a pencil).

• is not present in every hair.

• e is a layer of scales covering the hair shaft (compared to a layer of yellow paint on a pencil).

The structure of a hair can be compared to a number 2 pencil

The medulla

• Root

• is the central cell of the cortex (compared to the lead of a pencil).

  The medulla is not present in every hair.

• Medullais the central cell of the cortex (compared to the lead of a pencil)

• is the central cell of the cortex (compared to the pencil) The medulla is present in every hair.

The structure of a hair can be compared to a number 2 pencil.

cuticle and roots..

• The cuticle is a layer of scales covering the hair shaft (compared to a layer of yellow paint on a pencil). 4. The root is also known as the “end” (compared to the eraser on a pencil). 5. The tip is also known as the “distal end” (compared to the sharpened tip of a pencil).

• Aboriginal

  “distal end” yellow 2 pencil cuticle and roots are the bottom of the hair spikes.

• cuticles is a layer of scales covering the hair shaft (compared to a layer of yellow paint on a pencil tip). 4. The root is also known as the “proximal end” (compared to the eraser on a pencil). 5. The tip is also known as the “distal end fall” (compared to the not sharpened tip of a pencil).

• cuticles made out of white roots layer of scales covering the hair shaft (compared to a layer of yellow paint on a pencil). 4. The root is also known as the “proximal end” (compared to the eraser on a pencil). Sliding on the distal end that made out of the pencil erases.

. Characteristics used in hair comparison

• 1.Pigment colors (light, medium, dark, reddish-brown, brown, black, etc.) 2. Pigment sizes (fine, moderate, large) 3. Pigment density (light, moderate, heavy)

• Providing investigative pigment colors

• Conclusive DNA analysis

• Pigment colors (light, medium, dark, reddish-brown, brown, black, etc.) 2. Pigment sizes (fine, moderate, large) 3. Pigment diameter

  (dark, moderate, light)

. Characteristics used in hair comparison

• crayon distribution (random, peripheral, even, central, one-sided)

• Acrylics (random, peripheral, even, central, one-sided

• Aramid purple (random, peripheral, even, central, one-sided

• Pigment distribution (random, peripheral, even, central, one-sided)

Characteristics used in hair comparison

• Microscopic comparison presence, location, and level of an abundance of ovoid bodies (spheric to oval solid structures mostly found in cattle and dog hairs, but present in some human hairs)

• The presence, location, and level of an abundance of ovoid bodies (spheric to oval solid structures mostly found in cattle and dog hairs, but present in some human hairs)

• FTIR

• UV-Vis MSP , location, and level of an abundance of ovoid bodies (spheric to oval solid structures mostly found in cattle and dog hairs, but present in some human hairs)

Characteristics used in hair comparison

• The presence, location, and level of an abundance of cortical fusi (elongated spindle-shaped air spaces in the cortex)

  The presence of special characteristics (cuticle damage, artificial treatment.

• Satin presence and level of an abundance of cortical (elongated spindle-shaped air spaces in the cortex)

  The presence of characteristics (cuticle damage)

• An anagen root indicates an active growth stage. It is often found with a ribbon-like tip and a follicular tag (a soft tissue from the follicle). 2. A catagen root indicates the intermediate growth stage

• Plain comparison