Question

Using DNA profiling, DNA from a blood sample collected at a crime scene can be compared to DNA from a blood sample taken from a suspect. The DNA profile will show whether the blood from the crime scene belongs to the suspect.

Arrange the steps in the order needed to create a DNA profile from the two blood samples.
- blood is collected at a crime scene and from a suspect
- extract the DNA from the cells in each blood sample
- use PCR to amplify specific repeated DNA sequences that were cut from the DNA sample with restriction enzymes
- separate each of the two sets of DNA fragments by length using gel electrophoresis
- compare the DNA fragment lengths of crime scene blood and suspect's blood
- suspect identified or cleared

Answer 1

- blood is collected at a crime scene and from a suspect

- extract the DNA from the cells in each blood sample

- use PCR to amplify specific repeated DNA sequences that were cut from the DNA sample with restriction enzymes

- separate each of the two sets of DNA fragments by length using gel electrophoresis

- compare the DNA fragment lengths of crime scene blood and suspect's blood

- suspect identified or cleared

Step-by-step explanation: