Fingerprinting
What are three main classifications of fingerprints?
loop, whorl, arch
What shape is the lens in a microscope and how does it help in identifying evidence?
Dome shaped/curved
Why is using DNA an accurate way of identifying a suspect?
only identical twins have same DNA
Graphology a used to analyze a person's handwriting. What can it tell us about that person?
more about their personality
What is the meaning of the word suspect?
Someone who is suspected of committing a crime
In what two ways is fingerprinting one of the most accurate ways of identifying a suspect?
fingerprints are unique and never change
What type of evidence is blood?
biological evidence
Where do we get our DNA from? How much from whom?
parents, 50/50
Why is graphology not a popular method of identifying a suspect?
it is non-scientific and can be interpreted differently by different people
What is the meaning of the word victim?
The person the crime has been committed against
Explain two ways of fingerprinting a suspect. (We did one in class.)
rubbing finger in graphite, placing tape on the finger, placing tape on paper and classifying print or rolling finger on ink pad
What type of evidence is fiber and hair?
Trace
Give three examples of things that might be left a crime scene that contain DNA?
blood, saliva, hair, skin cells
What are three traits that are analyzed and interpreted by handwriting?
pressure, angle, size, pen stroke
What does it mean if someone had the "opportunity" to commit a crime?
The person may have been near the location at the time of the crime or has no alibi about another place he or she might have been
Name three locations fingerprints could be left and lifted easily?
any flat, hard surface that is not used by many people
Name the four components of blood?
plasma, red blood cells, white blood cells, platelets
How many different chemical bases make up our DNA, just in a different sequence?
4
Why might a note be left at the scene of a crime?
Ransom note asking for something in return for something else
What is the meaning of the word "motive"?
The reason for or motivation someone might have to commit a certain crime
What is a fingerprint that has been left but cannot be seen by the naked eye called?
latent
What are two types of microscopes used to look at items carefully, and what does each stand for?
light microscope, SEM (scanning electron microscope)
What does DNA stand for?
deoxyribonucleic acid
Explain how ink chromatography works.
Even black ink can be made up different colors, so when the paper absorbs water, the water separates the ink into its different color components
Use the following words correctly in a sentence or two: suspect, motive, alibi
The suspect had a solid motive for committing the crime and had no alibi, so he very well could have been there at the time the crime was committed.