This linear piece of DNA has the following restriction
sites:

                                   
EcoRI site
1             
         EcoRI
site 2      

____________2 kb________↓_________4 kb________↓_________5
kb__________________

Draw an electrophoresis gel depicting the band(s) that would
appear for each situation when the DNA is cut with
EcoRI.

Lane 1: No mutations.

Lane 2: A mutation altered restriction site 1.

Lane 3: A mutation altered both restriction sites.

Lane 4: A 1000-bp insertion occurred between the two
restrictions sites.

Lane 5: A 500-bp deletion occurred between the two restrictions
sites