Forensics Final Exam

Forensics Final Exam

GRADED A+ (ACTUAL EXAM ) Questions and Answers (Solved)

• Blood %

Answer:

45% cellular 55% plasma

RBC 41%

WBC 4%

• blood types

Answer: A, B, AB, O, Rh+, Rh-

• Protein polymorphisms used in forensic analysis

Answer: found in plasma, help to tell difference in blood sample of same

type

• Red Blood Cells (RBC)

Answer: have antigen markets for blood type

• White Blood Cells (WBC)

Answer: have DNA

• Human blood vs. animal blood

Answer: human blood does not have nuclei

• Processing crime scene with blood ?

Answer:

• Is it blood?
• Is it human blood?
• Is it all from one source?
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• Blood splatter analysis

Answer: the examination of the shapes, locations, and distribution

patterns of bloodstains, in order to provide an interpretation of the physical events which gave rise to their origin

• Blood droplet characteristics

Answer: A blood droplet will remain spherical in space until it drops onto

a surface Once a blood droplet impacts a surface, a bloodstain is formed.A droplet falling from the same height, hitting the same surface at the same angle, will produce a stain with the same basic shape.

• Point of Origin Blood Spatter

Answer: using angle of impact and stringing

• LVI vs HVI blood

Answer: Low velocity impact High velocity impact

• passive blood spatter

Answer: blood spatter caused by the falling of blood due to gravity

• forward spatter

Answer: blood that travels in the same direction as the source of energy or

force that caused the spatter

• Back spatter pattern

Answer: A bloodstain pattern resulting from blood drops that travel in

the opposite direction of the external force applied. Back spatter is often associated with a gunshot entrance wound.

• Draw-back effect

Answer: blood in the barrel of a gun

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