Blood Evidence
(T/F) Luminol would be considered a presumptive test for blood
True
Standard method for determining whether blood is human or animal
Precipitin Test
A person with A antigens would have blood type
A
T always pairs with
C always pairs with
A, G
Serology is
Study of bodily fluids
A blood droplet that is perfectly round would have an angle impact of_____ degrees
90
What does a positive test for a Hemastix look like?
The stick turns pink
A blood type that contains no A or B antibodies is
O
The database that stores DNA profiles is
CODIS
What is the formula for determining angle of impact?
x = sin-1 (w/l)
What type of evidence is blood classified as?
Class - just blood
Individual - if DNA is there
The substance turns blue in the presence of blood
Luminol
The clumping of red blood cells is called
Agglutination
A procedure that separates DNA fragments according to size is
Gel Electrophoresis
(T/F) Identical twins have the same DNA.
True
Investigators can individualize blood evidence by
Comparing the DNA from the cells
A "tail" begins to form on a blood stain. This shows the blood came from an impact of (less than 90/more than 90)
Less than 90 degrees
The presence or absence of how many antigens determines an individual's blood type in the ABO system
Two (A/B/O antigens and Rh antigens)
What are the three parts of a nucleotide?
sugar, phosphate, nitrogen base
Small droplets of blood distributed around a larger drop or pool of blood as a result of blood impacting the target surface
Satellite drops
(T/F) Red blood cells are used in the DNA typing of blood
False
A blood drop is measured 8mm x 8mm, what is the angle of impact?
Formula - X= sin-1 (w/l)
90 degrees
Create a punnett square for a person with heterozygous type A blood and a person with type O blood. What are the chances of a baby with type O blood?
50% chance of OO
What are STRs?
Short repeating units of DNA in-between genes
Nuclear DNA is inherited from _______ while Mitochondrial DNA is inherited from ________
both parents; mother only