Select all of the following statements that are true about mutations

Select all of the following statements that are true about mutations.

A. A mutation in one gene can be dominant to a mutation in a second gene.

B. A single mutation can have both dominant and recessive phenotypes. O

C. A dominant mutation may exhibit the recessive wild-type phenotype due to incomplete penetrance.

D. A dominant mutation may exhibit the recessive wild-type phenotype due to variable expressivity

E. Epistasis is when the mutant phenotype of one gene masks the mutant phenotype of a second gene.