Forensic Science Ch 11 Review

How can blood evidence be individualized?

The direction of blood droplets can be determined from the shape that it forms when they hit the flat surface. The tail of the elongated drop points to the travel direction. ... Blood spatters may reveal: Origin of blood stain.

What are the antigens for each blood type?

The eight blood types have different combinations of certain molecules, antigens, on the surface of the red blood cells. The A and B antigens are sugars and the Rh antigens are proteins. The antigens expressed in the red blood cells determine an individual's blood type. Donors with blood type O... can donate to recipients with blood types A, B, AB and O (O is the universal donor: donors with O blood are compatible with any other blood type)

Explain direction of impact on a target surface can be determined by blood spatter?

The texture of the target surface upon which a drop of blood falls affects the size and shape of the bloodstain pattern.

Explain how the type of target surface affects blood spatter patterns.

The texture of the target surface upon which a drop of blood falls affects the size and shape of the bloodstain pattern. Hard, nonporous surfaces will produce circular stain patterns that have smooth edges, but softer, porous surfaces will produce spatter stains that are scalloped or have rough edges.

What is agglutination? How is it used in determining blood type?

clumping of red blood cells; It's used to figure what antigens are in blood samples.

Explain how the angle of impact on a target surface can be determined by blood spatter. When does a tail begin to form on blood stains?

It can be determined by drawing lines from the various blood droplets to the point when they intersect.