Gel Electrophoresis and DNA

Based on these results whose blood was found in the blood stain at the crime scene?

• Bob

• Sue

• John

• Lisa

Which two bear species are most closely related?

• Bear 1 and Bear 2

• Bear 1 and Bear 3

• Bear 2 and Bear 3

• There’s no way to tell

Which suspect is likely guilty?

• Suspect #1

• Suspect #2

• Suspect #3

DNA fingerprinting works because

• Most genes are dominant
• All organisms contain RNA
• The most important genes are different among most people
• No two people, except identical twins, have exactly the same DNA 

DNA is recovered from a suspected dead soldier. Which Parents are the likely parents of the soldier?

• Parents C and D

• Parents E and F

• Parents A and B

• Parents G and H

What is the purpose of gel electrophoresis?

• helps cut DNA
• count the genes in DNA
• separates DNA based on size
• allows for an exact replicated organism

Why do the fragments of DNA in gel electrophoresis travel away from the negative electrode?

• DNA is negatively charged so attracted to the positive end of the unit
• DNA is positively charged to attracted to the negative end of the unit
• the agarose gel in negatively charged
• the agarose gel is positively charged

In gel electrophoresis, the largest DNA fragment will appear

• closest to the starting wells

• farthest from the starting wells

• three quarters away from the starting wells

• it depends on how many fragments there are

Which is the primary purpose of using restriction enzymes in gel electrophoresis?

• It allows the strands of DNA to be cut into various lengths for testing
• It restricts the number of base pairs that can be tested in a sample
• It makes the testing simpler by moving the strands into the gel faster
• It charges the DNA strands

The parents of a new baby believe they brought the wrong child home from the hospital. Gel electrophoresis was performed using DNA samples from the parents and the child. A section of the gel

electrophoresis results is shown below. Which conclusion is valid based on the gel electrophoresis results?

• They have the correct child, because her genetic information is identical to that of the father.

  
  

• They have the wrong child, because her genetic information does not match that of either parent.

• They have the correct child, because her genetic information came from both parents.

  
  

• They have the wrong child, because her genetic information matches only that of the mother.