Forensic Science - Hair and Fibers Flashcards

8264152556	The three parts of the hair	Cuticle, cortex, medulla	0
8264163070	The cortex is made of _________________	Keratin	1
8264194824	A row of cells running along the center of the cortex like a canal	Medulla	2
8264201526	The four types of the medulla	Absent, continuous, interrupted and fragmented	3
8264285546	The ratio of the diameter of the medulla to the diameter of the entire hair	Medullary Index	4
8264297894	The average rate of growth for human hair	1 cm per month	5
8264310448	The three stages of human hair growth	Anagen, catagen, and telogen	6
8264376125	Examples of hair configurations	Straight, curly, kinky	7
8264384170	Examples of hair tips	Cut, split, frayed, rounded, pointed	8
8264421827	The purposes of hair	Insulation to protect us from extreme temperatures and harmful sun rays.	9
8264447787	The average person has _______________ scalp hairs.	100,000	10
8264460867	Can be found in the hair root.	Nuclear DNA	11
8264465406	Can be found in the hair shaft	Mitochondrial DNA	12
8264482304	The outermost component of the hair shaft	Cuticle	13
8264544589	Embedded within the cortex and responsible for hair coloration	Pigment granules	14
8264553789	If your pigment granules are absent your hair color would be	Gray or white	15
8264565832	The basic element of any fabric	Fiber	16
8264573205	Wool comes from	Sheep and goats	17
8264579929	The two main categories of fibers	Natural or synthetic	18
8264591763	Fibers which are typically short and fine	Natural	19
8264604440	Fibers which are man-made	Synthetic	20
8264621947	Fabrics are composed of individual threads which are ________________, __________________, or ______________ together.	Knitted, woven or laced	21
8264640766	Fabrics which are woven with interlocking loops	Knitted	22
8264646466	Have warp and weft threads	Woven	23
8264737471	The three types of weave patterns	Plain, twill and satin	24
8264820494	Has a diagonal float pattern	Twill weave	25
8264845233	Produce over under ratios such as 3/1, 4/1, 5/1, 8/1, etc.	Satin weave	26
8264859483	Numerous fibers which are twisted together	Yarn	27
8264874826	Run the length of the fabric	Warp threads	28
8264882167	Cross over and under the warp threads	Weft threads	29
8264924025	Hairs and fabric are ______________________ evidence.	Class	30
8264948445	Hair is produced from a structure called the ______	Follicle	31
8264960693	Hair _____ and _____ is influenced heavily by genes.	Shape, texture	32
8264975060	In order to test hair for DNA, the _______ must be present.	Root	33
8264987970	Protein-rich structure around the medulla that contains pigment	Cortex	34
8264997070	The structure of hair has been compared to that if a ________.	Pencil	35
8265022650	Characteristics of the cuticle may be important in distinguishing between hairs of different _______ but are often not useful in distinguishing between different _________.	Species, people	36
8265052075	The cortex varies in _________, _________ and __________.	Thickness, texture, color	37
8265068305	The most important component in determining from which individual a human hair may have come.	Distribution of the cortex	38
8265080491	The medulla may vary in ______, _______, and ________.	Thickness, continuity, opacity	39
8265114146	The discovery of ___________ and multiple fiber transfers between the suspect's clothing and the victim's clothing dramatically increase the likelihood that these two individuals had physical contact.	Cross transfer	40
8265129240	Examples of natural fibers	Cotton and wool	41
8265135752	Examples of synthetic fibers	Nylon, rayon and polyester	42