Characteristics Of Blood

What does the term presumptive mean?

Used to determine if a stain at a crime scene could be blood

Why are many of the tests used to identify blood only considered to be presumptive?

There is a high chance of false positives, especially if other stuff w/ metal ions is present

Hemastix Test

Hemoglobin - turns bluish/ green

Luminol

Iron - Turns Black

Hydrogen Peroxide

Iron - Creates Bubbles

Kastle MeyerTHe

Hemoglobin - turns hot pink

What chemicals were used for the Kastle Meyer test?

Ethanol, phenolpthanein, hydrogen peroxide

What does the term agglutinate mean>

The clumping of blood when cutigens + antigens react

There are antibodies in the blood found

In the serum portion

What happens if a person with type AB blood is given a transfusion for type A blood

They will be fine because they already have A - Antigens and people with AB blood do not make any antibodies

A woman has a blood type of O, but her mother was blood type A and her father was blood type B. How is this possible?

Mom and Dad each carried all O allele

Why can a person with A blood donate to a person with AB blood but the reverse is not true

Because a person with A blood make Anti- B antibodies so the person with A blood would be rejected

What is the universal acceptor

AB +

What is the universal donor

O -

Is blood type considered class or individual evidence?

Class because only 8 blood types for billions of people

What component makes up the biggest % of our blood

Plasma - 55%

What is the most common blood type

O+

What happened in the Mya Lyons case

Father convicted of killing his daughter after blood was found in the air vents of his van

What happened in the Chris Vaughn case

Oswego dad who killed wife and three kids shooting them

Summarize the OJ Simpson case

Not guilty of brutally stabbing ex-wife Nicole Vrown and her friend Ron Goldman

What is a secretor?

Antigens found in other body fluids along with the blood

What test can determine whether blood is human or animal?

Precipitin

What is the basis for a precipitin test

Inject human blood into rabbits

Why is the serum used in this test called human antiserum

Because it is made of antibodies that would attack human blood