Transcript Forensic Serology

Forensic Serology

Objective: To learn
the roles of antibodies
and antigens in the
compatibility of blood
typing
Brainpop
Hemoglobin
 Blood Plasma
 White Blood Cells
 How many pints of blood does an adult
human have?

Components of Blood
Red Blood Cells
_____________
White Blood Cells
2. _____________
Plasma
3. _____________
Platelets
4. _____________
1.
Red Blood Cell
(Erythrocytes)


oxygen to
Carry ________
cells
O2 binds to
hemoglobin
___________
White Blood Cells
(AKA Leukocytes)


protect
Help _________
the
body against
foreign cells
_____________
Antibodies are a
__________
type of WBC
Contrast RBC’s to WBC’s
Analysis Questions
1.
2.
Give an example of a white blood cell
Discuss differences between RBC’s and
WBC’s
ABO Blood Groups

The four blood
groups
– A
– B
– AB
– O
Determining Blood Type

Antigens
– Found on
surface
_____________
of
RBC
– Type of antigen on
determines
RBC ____________
blood type
– Ex
Continued

Antibodies
– Destroy
foreign cells
__________
– Non-matching
_________
antibody
found
in ___________
plasma
– E.x.
Rh Factor

Makes blood type
either + or –

Rh+
– Rh antigen
________
present

RhNo Rh antigen
– ____
Blood Typing
Agglutination

Occurs when
matching
antibodies
__________ and
antigens _______
bind

Results in
clumping
____________
of
blood
ABO Blood Types Chart
Blood Type
A
B
AB
O
Antigen on
RBC
Antibody in
Plasma
Blood Typing Game
Patient #1
Blood Type:
Able to receive:
Patient #2
Blood Type:
Able to receive:
Patient #3
Blood Type:
Able to receive:
Blood Typing Game

http://nobelprize.org/educational/medicine
/landsteiner/
Plasma and Platelets

Plasma
– Transports
substances
__________

Platelets
– Help form
blood clots
___________
Crime Scene Analysis
QuickTime™ and a
YUV420 codec decompressor
are needed to see this picture.
Forensic Serology

The study of
_____________
body fluids

E.x
Blood
Semen
Fecal matter
Blood Stain Patterns

The pattern ________
blood
makes when it lands
a surface
on ___________
Types of patterns:
1. Passive
gravity
– Due to ___________
Continued
2.
3.
Transfer
– Bloody objects
touch
__________
a
surface
Impact
projected
– Blood ________
through air
Analyzing Blood Spatter
Spines
Point in the
direction
___________
of
travel
 Parent Drop
Drops from which
______
satellite spatter
___________
originate
 Satellite Spatters
Drops that
break
away from
_________
parent drop

Surface Texture
Soft
 _____
porous
less
surfaces = ______
spatter

Ex.
– Cloth
– carpet
What can you determine based
on evidence?
Impact Angle Analysis
The angle formed between
___________ and __________
blood
a surface
Velocity of spatter
 High
– Diameter _____________
less than 1 mm
 Medium
– Diameter _____________
between 1-4 mm
 Low
greater than 4 mm
– Diameter _______________
A Dingo Ate My Baby!!!
Lindy Chamberlain
Camping Trip August 1980
 Claimed a dingo took her
daughter
 What type of evidence
would you look for?

https://www.youtube.com/watch?v=VKxiqa6kdrI
Blood Spatter Analysis

http://www.sciencechannel.com/tvshows/science-channelpresents/videos/discoveries-this-weekblood-splatter.htm
Analyzing Impact Angle
Walking Fast vs Walking Slow
No Movement
Which set of results is correct?
The effect of movement on
spatter

Speed

Angle

Direction
Analyze the Evidence Below
Rotten Student!

Mrs. Rosewitz was writing the agenda on
the board while her students worked on
their blood spatter labs at their desks.
Suddenly she felt something fly past her
head and heard two distinct smacks hit the
board. She believes that one of her
students threw paint at her. She spun
around to see who the culprit was, but all
suspects seemed to be hard at work at
their desks.
At the Crime Scene
Investigator must ask:
1. _______________
2. _______________
3. _______________
Crime Scene Tests

Luminol-

How does it work?