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Forensic Science - Hair and Fibers Flashcards

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8264152556The three parts of the hairCuticle, cortex, medulla0
8264163070The cortex is made of _________________Keratin1
8264194824A row of cells running along the center of the cortex like a canalMedulla2
8264201526The four types of the medullaAbsent, continuous, interrupted and fragmented3
8264285546The ratio of the diameter of the medulla to the diameter of the entire hairMedullary Index4
8264297894The average rate of growth for human hair1 cm per month5
8264310448The three stages of human hair growthAnagen, catagen, and telogen6
8264376125Examples of hair configurationsStraight, curly, kinky7
8264384170Examples of hair tipsCut, split, frayed, rounded, pointed8
8264421827The purposes of hairInsulation to protect us from extreme temperatures and harmful sun rays.9
8264447787The average person has _______________ scalp hairs.100,00010
8264460867Can be found in the hair root.Nuclear DNA11
8264465406Can be found in the hair shaftMitochondrial DNA12
8264482304The outermost component of the hair shaftCuticle13
8264544589Embedded within the cortex and responsible for hair colorationPigment granules14
8264553789If your pigment granules are absent your hair color would beGray or white15
8264565832The basic element of any fabricFiber16
8264573205Wool comes fromSheep and goats17
8264579929The two main categories of fibersNatural or synthetic18
8264591763Fibers which are typically short and fineNatural19
8264604440Fibers which are man-madeSynthetic20
8264621947Fabrics are composed of individual threads which are ________________, __________________, or ______________ together.Knitted, woven or laced21
8264640766Fabrics which are woven with interlocking loopsKnitted22
8264646466Have warp and weft threadsWoven23
8264737471The three types of weave patternsPlain, twill and satin24
8264820494Has a diagonal float patternTwill weave25
8264845233Produce over under ratios such as 3/1, 4/1, 5/1, 8/1, etc.Satin weave26
8264859483Numerous fibers which are twisted togetherYarn27
8264874826Run the length of the fabricWarp threads28
8264882167Cross over and under the warp threadsWeft threads29
8264924025Hairs and fabric are ______________________ evidence.Class30
8264948445Hair is produced from a structure called the ______Follicle31
8264960693Hair _____ and _____ is influenced heavily by genes.Shape, texture32
8264975060In order to test hair for DNA, the _______ must be present.Root33
8264987970Protein-rich structure around the medulla that contains pigmentCortex34
8264997070The structure of hair has been compared to that if a ________.Pencil35
8265022650Characteristics of the cuticle may be important in distinguishing between hairs of different _______ but are often not useful in distinguishing between different _________.Species, people36
8265052075The cortex varies in _________, _________ and __________.Thickness, texture, color37
8265068305The most important component in determining from which individual a human hair may have come.Distribution of the cortex38
8265080491The medulla may vary in ______, _______, and ________.Thickness, continuity, opacity39
8265114146The 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 transfer40
8265129240Examples of natural fibersCotton and wool41
8265135752Examples of synthetic fibersNylon, rayon and polyester42

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