n a cross between two heterozygous individuals, the offspring would be expected to show a 3 : 1 ratio. For example, in Case 1, three-fourths of the individuals would have red (wild-type) eyes, and one-fourth would have sepia eyes.
If there are 44 offspring, how many are expected to have red eyes?
We expect three-fourths to have red eyes.
34 of 44 = 33
If there are 44 offspring, how many are expected to have sepia eyes?
14 of 44 = 11
Now you are ready to calculate chi-square.