9. Expression of p53 is essential in DNA repair pathways. In wild-type cells without DNA damage, p53 is expressed at a moderate level. In response to DNA damage, WIP-1 is degraded, allowing for a higher level of expression of p53. You have a null p38MAPK-/- mouse and a null WIP-1 -/- mouse, and you cross the two mice. (Assume that the mice are wild type at all other unlisted loci and that the wild-type allele of each gene is dominant.) You interbreed the F1 to produce 500 F2 progeny. What is the expected ratio of the F2 progeny that will have a higher level of p53 expression even in the absence of DNA damage?​