If a red-eyed homozygous fly (RR) and a red-eyed heterozygous fly (Rr) mate together, what are the possible genotypes of their offspring?

Question

brittanyrolfe · Answer

When approaching this question, you should first create a punnett square. This is what you should do every time you have a question that asks you to find the probability of offspring. Make sure to assign each allele to each square... like so:
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brittanyrolfe · Answer

Now that you have your punnett square successfully set up, now it is time to fill in each of the squares. So in row 1 column 1, you are going to put the big R from the side in the box and the big R from the top in the box so that now you have 2 allele for each gene. Remember that each gene should have a minimum of 2 allele. If you only have one in a box, then you did it wrong. So if we follow this pattern, your punnett square should look like this:
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