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Description and use of test crosses

We have to attach all of the sources. I am having trouble finding anything but examples and biology teacher notes. I have worked on this for 2 days and only have an opening statement that seems to pretty much sum up everything. I need to avoid unnecessary information but I feel I have limited resources. Can someone please elaborate of the test cross and its usefulness.

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The first thing you need to do (as with writing any paper) is to come up with topics you want to cover that relate to the subject at hand (ie. test crosses). Since you've got two pages to utilize you can tackle a few things.

Let's start by brain storming to come up with things you might want to discuss relating to test cross.
-what is it? Obviously some kind of definition of what it is will be necessary this doesn't need to take up too much room as your audience (your prof or TA) will already know what test crosses are but giving an explanation and possibly general examples wii set the stage for a more detailed exploration of the topic.

For a definition you can use something as simple as a dictionary (since I love online sources I'll provide you with some useful links found by typing keywords into a common web search server). list a simple but useful definition....
"test-cross - a cross between an organism whose genotype for a certain trait is unknown and an organism that is homozygous recessive for that trait so the unknown genotype can be determined from that of the offspring"

Just looking at the definition a few ideas spring to mind. Why would you want to do a test cross (this will aid in the discussion of their usefulness)? So the big thing from this definition is doing a test cross to identify unknown genotypes. But why would that be important?

Let's look for some examples to help us. We can rule out human examples as there are many many ethical issues involved in ...

Solution Summary

Explanation and usefulness of test cross in agriculture, research etc.