Q: Use hoops, arches, plants, etc. to make your fish tank into an obstacle course. Once you've taught your fish how to swim through hoops, they should be able to swim through and around anything with some guidance. Be patient when teaching your fish how to swim through an obstacle course, as it may take some time. Your fish will most likely follow your finger around once it has mastered that trick, so lead your fish through its obstacle course. Start with simple obstacle courses, and make them harder once your fish starts to master the obstacles. Use a treat on a string or a hood to lead your fish around instead of your finger. If you want your fish to follow you all around the tank, it may be hard for you to use your finger. Stick a treat on a hook, stick, or string and move it around the course so that the fish follows it. Make sure the fish doesn't get the treat until it's finished the course. Just like all the other tricks, positive reinforcement will help train your fish quickly. Give them a treat every time they complete the obstacle course. If you've had the treat on a hook, make sure to remove it from the hook before feeding it to the fish.
A: Decorate your fish tank like an obstacle course. Lead your fish around the course with your finger or a treat. Reward your fish with a treat after it completes the obstacle course.

Q: A primer is a molecule that binds to a particular sequence of DNA. Once bound, the binder can be detected to determine whether or not that sequence was present in the sample. This allows for testing of specific sequences that correspond to a certain genotype. Once you have selected a primer that binds to the sequence in question, you will need to extract DNA from the cell. Follow the appropriate extraction protocol for your lab. Once you have collected a sample, you can test it. Add the primer to the DNA sample. If the sequence corresponding to that primer is present, it will bind to the molecule. Once this is complete, you can move on to analysis. For simple cases, the results simply come back as positive or negative based on whether or not the primer was bound to the DNA strands. Some more complex methods may require post-PCR procedures. These procedures can be lengthy and expensive, and are avoided when possible.
A:
Select a primer. Collect a DNA sample. Add the primer to the sample. Analyze the results.