If X0 and X1 are both generic, the theories of the degrees
below X0 and X1 are the same. The same is true if both are
random. We show that the n-genericity or
n-randomness of X do not suffice to guarantee that the degrees
below X have these common theories. We also show that these two theories (for
generics and randoms) are different. These results answer questions of Jockusch
as well as Barmpalias, Day and Lewis.