A person that is bloodtype A has what antigen in blood
A antigen
One parent is genotype AB the other parent is genotype OO. A possible genotype for an offspring is:
AO
The _________ of a bloodstain generally points to the direction of travel of the blood drops
tails
DNA is a ___________
polymer
Which is not a component of a nucleotide?
double helix
Which of the following depics correct base pairing of DNA
T-A
G-C
Portions of the DNA molecule useful for DNA typing:
are repeated many times
What is the number of nitrogenous bases needed to code for a specific amino acid?
3
The technology of DNA typing had its beginnings in 1985 with the work of
Alec Jeffreys
As currently performed in forensics, DNA fingerprinting tech cannot provide information helpful in
determining whether an individual carries a genetic defect
Restriction enzymes
cut DNA at specific sites
During gel electrophoresis the DNA is
separated by fragment size
PRC is a technique that
can produce many exact copies of segments of DNA
STRs normally consist of repeating sequences of
3-7 bases
A person that is blood type B-, can receive what bloodtype in a transfusion?
B- ; O-
Waht could be the cause of high velocity blood spatter?
gunshot
The angle of impact of an individual bloodstain can be estimated using the ratio of ______ divided by _______
width ; length
What is the definition of a transfer blood stain?
when a stain is transfered from one object to another
What are the four nitrogneous bases found in DNA
A , T, C, G
What are advantages of working with short DNA fragments?
more stable
less likely to break
_________is a national system of shared databases of DNA typing information
CODIS
3 major classes of fingerprint patterns
loops ,arches, whorls
The most common ridge pattern
loop
The number of deltas found in a typical arch pattern
zero
How many ridge characteristics are in the average fingerprints
150
A person's fingerprints are formed at during....
fetal development
The purpose of friction skin ridges
firmer grip and resist slippage
The pores of sweat gland are located in ....
skin ridges
In orer to permanently damage the fingerprint one must damage what layer of skin
dermal papillae
Sweat glands on the friction ridges don not produce what molecule?
oil
The fingerprint primary classification system that classifies prints based on the number and location of whorls is called what?
Henry System
This is what determines the minumun number of ridge characteristics need to math two fingerprints?
experince of the investigator
The computerized system for storing fingerprints in known as
AFIS
This man has an almost exact double who had the same Bertillion measurements as him
will west
Prints that not readily visible are known as
latent prints
Prints impressed into a bar of soap are known as
plastic prints
Sublimation occurs with the use of this lifting method
iodine fuming
Ninhydrin is used to detect this type of molecule in latent fingerprints
amino acid
Superglue fuming is not suitable for this type of surface
porous surface
Example of porous surface
paper, wood, cloth
This fingerprinting metho produces a temporary orange/brown print
iodine fuming
This chemical treatment produces a white-appearing permanent fingerprint
superglue fuming
This fingerprinting metho produces a permanent purplish print
ninhydrin
These two fingerprinting methods are use on porous surfuces
iodine fuming and ninhydrin
These two types of hairs have a saber-like shape
eyebrows and eyelash
this type of hair has a top that is often darker, is long and fine, and is arc-like
chest hair
the longest stage gof hair growth
anagen
3 stages of hair growth
anagen
catagen
telogen
During this stage the root becomes club-shaped
telogen
the shortest stage of hair growth
catagen
The color of a person's hair is based on pigmetation which is found in the _________ of hair
cortex
A narrow medulla width usually indicates that a(n) ____ is the source of a hair and wide medulla width usually indicates that the source of the hair is a(n)_______?
human ; animal
DNA can usually be collected from hair that has been forcibly removed. T/F
True
What are the areas of a peice of hair sample which may contain nuclear DNA samples?
root an the follicular tissue attached to the root
Hair evidence is the ______ common type of trace and transfer evidence.
most
Hair is considered ________ evidence because a forensic scientist is never able to conclusively say that a particular hair came from a particalur source
class
all of the following make hair significant except
people dye hair odd colors
The cuticle is also referred to as the "______" of the hair
scales
A hair with a very thick and round cross-sectional shape is typically associated with the _________ racial designation
Monogoloid
Fiber evidence is ________ common type of trace and transfer evidence
second most
Fibers are analzed from 3 view points as individual fibers, _________ and as fabric or another type of end product
threads
Two broad groupings of fibers are _______ an __________
natural and manmade
cashmere is fiber from
a goat
rayon is classified as a
regenerated fiber
1. Bullets are examined to determine if the pattern of found on the bullet match the pattern of contained in the barrel of the questioned firearm.
rifling impressions , rifling
have the potential to be consistently reproduced in a ______________ pattern on every bullet that passes down the barrel of a firearm.
straition, unique
A bullet is slightly larger in diameter than the of the barrel in which it is designed to be fired.The bore diameter is the As a result, a rifled barrel will impress a of itself on the sides of the bullet.
bore diamater
distance from the opposite land in a barrel
negative impression
One
of the biggest problems in making an identification is that ....
few evidence bullets are submitted intact. Most are
badly distorted, wiped and/or fragmented.
__________ is a term used to indicate the diameter of a
bullet in hundredths of an inch. A bullet that is 30 hundredths of an inch (.30) in diameter is called a ________________
