There are also cases of parthenogenesis in some organisms - could not a single mutation cause parthenogenesis?
I'm pretty doubtful that a single mutation
could give rise to parthenogenesis. There are examples of environmental triggers of parthenogentic development in mice and rabbits, but those embryos od not reach full term. Certainly it would be problematic to explain giving birth to a male offspring as the result of any natural form of partheneogenesis.
TTFN,
WK