DNA has a double helical arrangement made of two linked strands. Draw a block diagram of DNA with two repeat units in each strand. Label every part, and show and label the bonds between the strands.
DNA stores genetic information. Outline the main stages in DNA replication.
At the first stage of DNA fingerprinting, a DNA sample must be broken into shorter fragments. What could be used to carry out this fragmentation?
Name the analytical method used to separate these short fragments.
After the fragments have been separated, what could the DNA fingerprint be treated with to show the position of the bands?
A sample of blood, believed to have come from the suspect, was discovered at a crime scene. The DNA from the blood sample, and from four possible suspects, was analysed. Using this evidence, circle the suspect who should be arrested.