PGASetMutationProb(3) on Linux
The text 624d399e2fc3, as Debian 3.1 (Sarge), Debian 3.0 (Woody), Debian 2.2 (Potato), Debian 2.1 (Slink), Debian 2.0 (Hamm), Debian 1.3 (Bo), Debian 1.2 (Rex), Debian 1.1 (Buzz) shipped it.
Specifies the probability that a given allele will be mutated. If this is called without calling PGASetMutationType(), the default mutation type is PGA_MUTATION_FIXED. The default probability is the reciprocal of the string length.