The protein p53 is a tumor suppressor; it is important in preventing cancer in humans. What phenotype would you expect in p53 knockout mice?

O p53 knockout mice would not be helpful in the study of a human disease.
O p53 knockout mice would not be able to go through meiosis.
O p53 knockout mice would be more susceptible to cancers.
O p53 knockout mice would not get cancer.
O p53 knockout mice would not be able to go through mitosis.