Forensic Science Chapter 3 The Study Of Hair Mcnair Academic

Front 1

Hair is considered _____ evidence.

Back 1

Hair is considered class evidence.

Front 2

When the_____of a hair is present, DNA evidence may be obtained.

Back 2

When the follicle of a hair is present, DNA evidence may be obtained.

Front 3

What is individual evidence.

Back 3

individual evidence is evidence that identifies a particular person or thing

Front 4

what is trace evidence?

Back 4

small amount of biological or physical evidence left at a crime scene

Front 5

The use of the_________________ to perform side-by-side analysis of hairs collected from a crime scene and hairs from a suspect or victim first occurred in 1934 by Dr. Sydney Smith.

Back 5

The use of the comparison microscope to perform side-by-side analysis of hairs collected from a crime scene and hairs from a suspect or victim first occurred in 1934 by Dr. Sydney Smith.

Front 6

A hair consists of two parts, what are they?

Back 6

A hair consists of two parts: a follicle and a shaft

Front 7

The________is a club-shaped structure in the skin.

Back 7

The follicle is a club-shaped structure in the skin.

Front 8

The hair shaft is composed of the protein __________which is pro- duced in the skin.

Back 8

The hair shaft is composed of the protein keratin, which is pro- duced in the skin.

Front 9

If the _________of the hair is present, DNA may be extracted, amplified, and compared to known samples for identification.

Back 9

If the root of the hair is present, DNA may be extracted, amplified, and compared to known samples for identification.

Front 10

The hair shaft is made up of three layers:

Back 10

The hair shaft is made up of three layers: an inner medulla,a cortex, and an outer cuticle.

Front 11

A good analogy for the struc- ture of a hair shaft is the structure of a pencil

Back 11

a pencil

Front 12

name the five different patterns of medulla

Back 12

continuous
interrupted(intermittent)
fragmented or segmented
solid
none

Front 13

Forensic scientists distinguish six types of hair on the human body name them

Back 13

(1) head hair, (2) eyebrows and eyelashes, (3) beard and mustache hair, (4) underarm hair, (5) auxiliary or body hair, and (6) pubic hair.

Front 14

Hair proceeds through three stages as it develops. name them

Back 14

anagen stage (most active growth here) T
The catagen stage follows as the hair grows and changes (perhaps turning gray).
The final stage is the telogen stage. During this stage the hair follicle is dormant or resting and hairs are easily lost. A

Front 15

Bleaching hair removes _______and gives hair a ______ color.

Back 15

Bleaching hair removes pigment granules and gives hair a yellowish color.

Front 16

Human hair grows at a rate of about ___ per month

Back 16

Human hair grows at a rate of about 1.3 cm per month approximately 0.44 mm per day)

Front 17

Measuring the length of hair that is naturally colored and dividing by 1.3 cm provides an estimate of the number of months since the hair was colored.

Back 17

Measuring the length of hair that is naturally colored and dividing by 1.3 cm provides an estimate of the number of months since the hair was colored.

Front 18

Animal hair and human hair have several differences, name them

Back 18

the pattern of pigmentation, the medullary index, and the cuticle type.

Front 19

Human hair has cuticle scales that are flattened and narrow, also called ______.

Back 19

Human hair has cuticle scales that are flattened and narrow, also called imbricate.