Usually when you are trying to figure out different possibilities of offspring using punnet squares, 4 genotypes can be figured out. I think that it also depends on how you are finding out the different genotypes for offspring.
Because a hypothesis is different from the research question, research is usually required before you make a hypothesis. A hypothesis is a prediction of the test that is about to incur. Without the research the people doing the test would not know what to be looking for or how to setup the test. Because of the reason;
I assume the answer is, after generating an idea from an observation.
