Fingerprints
How are fingerprints collected?
Tape/ dust
What is blood made of? Explain each
red blood cells: carry oxygen
white blood cells: fight forgein invaders
platelets: clot blood
What constitutes a blood splatter?
A group of blood stains
What is the probability that someone will have type A-, MN
3.024%
What do fingerprints help with?
Grip
What fingerprint pattern is this?
tented arch
What is agglutination?
What is cohesion and adhesion?
Cohesion is the force between two similar substances
Adhesion is the force between two unlike substances
What is the probability that someone with have Type B+, MM?
3.06%
What do we use to find blood that is not there?
Luminol + hydrogen peroxide
How are fingerprints formed?
Fingerprints are formed during the 10th week of pregnancy when the basal layer grows faster than the dermis and epidermis layer causing folds in the epidermis.
We will add antibodies that react to A and B proteins to the tested blood and see if there is clumping. If there is clumping, that means that the blood has that specific protein.
What is the line of convergence?
The area where if you were to draw lines from the blood splatters, they will intersect at one spot determining the source of the blood
DOUBLE POINTS!!!!
What is the probability that someone will have Type O+, NN?
8.04%
What are white blood cells, red blood cells, and platelets submerged in?
plasma
What are the 9 fingerprint ridge characteristics? Draw them
Fork, dot, island, double bifurcation, trifurcation, ridge ending, eye, bridge
What happens when a foreign invader is recognized by our immune system?
Phagocytes engulf the invader killing it
B-lymphocytes create antibodies
What are the steps after blood is found?
1. Check if it's blood
2. Check if the blood is human
3. Test for DNA or blood typing
(7+2-4+1-5+8-9-2-4+15)/2
4.5
Integrated Automated Fingerprint Identification System
What are the 3 types of fingerprints that can be left behind? Explain.
Patent, Plastic, latex
Which part of the blood do we use for DNA testing? Why?
We use white blood cells because they are the only one with a nucleus which contains DNA
What are the 6 patterns into which blood splatters? Explain
passive fall
arterial spurts/gushes
splashes
smears
trails of blood
pools of blood
What is the probability that someone will have AB-, NN, PGM-2 (Phosphoglucomutase 6%)
.00594%
What are the scientific names of red blood cells/ white blood cells, or platelets? I only need one
Red blood cells: erythrocytes
White blood cells: leukocytes
Platelets: thrombocytes