I suggest making a table, also known as a Punnett square, for this type of problem.
X| C | c
That's the best I could do to make the table, but it works. There are four squares here, each representing a possible outcome for the offspring. Two outcomes are Cc, a red fruit. Two are cc, a yellow fruit. This is interpreted to be that the probability of a red fruit is 1/2.
Hope this helps, and if you need further help with problems like this, I suggest doing some research on Punnett squares. They are an extremely useful technique when solving these types of problems.