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# 1)     Perform a dihybrid cross between heterozygous fish parents with the genotypes WwSs and WwSs (W =

white, w = red, S = smooth, s = scaly). What is the probability that an F1 generation fish will be homozygous dominant for both traits, if it is born white and is smooth (no scales)?

First, use a 4×4 Punnett square to cross the two parents together (this is a dihybrid cross). You will have to generate the parental gametes, arrange them properly around the square, then complete the Punnett square with the offspring’s genotypes. You may use the diagram below or draw your own.

2.) Next, use the appropriate probability formula to answer the question above. To get full points, you must write out the equation and show your work all the way through. (Hint: it would be a good idea to color-code certain genotypes above.) Please draw a box around your final answer.