Forensics B Final Exam Review Part 1

Hemophilia is a disease that affects the number of thrombocytes, or platelets, in the body. Which choice correctly connects hemophilia to a symptom that it has on the body?

• Frequent infections

• Cold hands and feet

• Excessive bleeding when cut

• Hair loss

Mickey the Moron isn’t feeling well and decides to go to the doctor. In the exam room the nurse asks Mickey his blood type. Mickey says “I have O blood. I remember as a child my mother telling me that I have the Bo gene combination.” How would you evaluate Mickey’s statement?

• Mickey has type O blood because O is dominant

• Mickey has type O blood because he has the Bo genotype

• Mickey cannot have type O blood because O is dominant

• Mickey cannot have type O blood because his genotype is Bo

What blood type is considered to be the universal donor and why?

• Type A is the universal donor because it does not have any antigens on RBC

• Type B is the universal donor because it does not have any antigens on RBC

• Type AB is the universal donor because it does not have any antigens on RBC

• Type O is the universal donor because it does not have any antigens on RBC

What change in blood drop size, and why, would you expect to see if blood drop A was dropped from a height of 5 cm and blood drop B from a height of 15 cm?

• Blood drop A would have a smaller diameter than blood drop B because as height increases, the size of blood drops increases

• Blood drop A would have a larger diameter than blood drop B because as height increases, the size of blood drops decreases

• Blood drop A would be the same size as blood drop B because height does not have an effect on the size of blood drops

In the figure to the right, letter X is pointing to _______ and letter Y is pointing to _____.

• X = spine, Y = satellite

• X = spine, Y = cast-off

• X = satellite, Y = tail

• X = satellite, Y = spine

Refer to the following photos of blood-spatter patterns. Based on the relative size of the blood spatter, blood velocity and spatter size, determine which pattern could have been produced as a result of a gunshot wound and which one could have resulted from a blow to the head.

• Photo A represents high velocity = gunshot wound, while photo B represents low velocity = blow to the head

• Photo A represents high velocity = blow to the head while photo B represents low velocity = gunshot wound

• Photo A represents low velocity = gunshot wound, while photo B represents high velocity = blow to the head

• Photo A represents low velocity = blow to the head, while photo B represents high velocity = gunshot wound

Observe the two photos below. What evidence can be obtained by viewing a single drop of blood?

• Blood drop A is a passive blood drop and appears to have hit the surface at a 90⁰ angle. Blood drop B is elongated and appears to have hit the surface at an angle of approximately 20⁰ - 25⁰.

• Blood drop A is a passive blood drop and appears to have hit the surface at a 30⁰ angle. Blood drop B is elongated and appears to have hit the surface at an angle of 90⁰.

• Blood drop A is an elongated blood drop and appears to have hit the surface at a 90⁰ angle. Blood drop B is passive and appears to have hit the surface at an angle of approximately 20⁰ - 25⁰.

• Blood drop A is an elongated blood drop and appears to have hit the surface at a 30⁰ angle. Blood drop B is passive and appears to have hit the surface at an angle of 90⁰.

What would larger, more circular blood drops say about a situation than if the blood drops were smaller and more elongated?

• Larger, elongated drops form from larger heights and larger angles when a surface is hit

• Larger, more circular blood drops form from larger heights and larger angles when a surface is hit

• Larger, more circular blood drops form from smaller heights and angles when a surface is hit

The spatter in the picture below could be created by which of the following circumstances?

• Injury causing internal bleeding & blood comes out of the nose or mouth

• Blood dripping off someone’s hand

• Someone cleaning up a scene

• Object in front of wall during injury & then removed

Identify the spatter pattern in the picture below.

• Cast-off

• Low velocity

• Arterial

• Transfer