Mutations 1

Mutations are the only known means by which new genetic material
becomes available for evolution (a).

a. “Ultimately, all variation is, of course, due to mutation.” Ernst
Mayr, “Evolutionary Challenges to the Mathematical Interpretation of
Evolution,” Mathematical Challenges to the Neo-Darwinian
Interpretation of Evolution, editors Paul S. Moorhead and Martin M.
Kaplan, proceedings of a symposium held at the Wistar Institute of
Anatomy and Biology, 25–26 April, 1966 (Philadelphia: The Wistar
Institute Press, 1967), p. 50.

“Although mutation is the ultimate source of all genetic variation, it
is a relatively rare event, ...” Ayala, p. 63.

http://www.creationscience.com/onlinebook/LifeSciences9.html#wp1008854