Fill in the Punnett square below to show the possible offspring from a Gg x Gg cross. What are the genotypes and phenotypes of the offspring?

Both gradualism and punctuated equilibrium are talking about the same thing - the change of traits. However, it is true that neither of the two are completely correct as actual trait changing involves parts from both. It is also true that punctuated equilibrium is slightly biased because it is less commonly the case that something changes in one point. 
Hope This Helped!