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Exam 15: Forensic Serology

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Question 51

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Type O blood is the most common in the United States.

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Question 52

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Non-motile sperm generally survive for up to four to six hours in the vaginal cavity of a living female.

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Question 53

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Luminol can be used at crime scenes to:

The D antigen is also known as the ________ antigen.

Gel diffusion takes advantage of the fact that antibodies and antigens move toward one another on a plate.

In routine blood banking, which antigen(s) must be determined in testing for compatibility?

When an animal is injected with an antigen, the animal will respond by producing:

Match the word in Column 1 to its definition in Column 2. Each answer can only be used once. A)A protein that destroys or inactivates a specific antigen B)An abnormally low sperm count C)The liquid that separates from the blood when a clot is formed D)The physical manifestation of a genetic trait such as shape, color, and blood type E)A structure in the cell nucleus composed of DNA, along which the genes are located F)A substance that stimulates the body to produce antibodies against it G)The basic unit of heredity, consisting of a DNA segment located on a chromosome H)The clumping together of red blood cells by the action of an antibody I)The male sex chromosome J)An enzyme found in high concentration in semen K)The female sex chromosome L)The fluid portion of unclotted blood M)Any of several alternative forms of a gene located at the same point on a particular pair of chromosomes N)The absence of sperm cells in semen O)The particular combination of genes present in the cells of an individual -Antibody

Human bloodstains dried for years may still give a positive reaction for a precipitin test.

To determine whether a bloodstain is of human or animal origin, the serologist will perform:

What three questions must the criminalist answer when examining dried blood? Which tests or analysis tools can be used to answer each question?