Unfertilized eggs yield fatherless mouse.
Men may not be obsolete yet, but I'd say our biological clock is ticking. In trying to imagine a world without men, and how huMANity might get there, I'm put in mind of the short stories "Houston, Houston, Do You Read" by James P. Tiptree, Jr. (aka Alice Sheldon), "An Old-Fashioned Girl", by Johanna Russ, and "Men Are Trouble", by James Patric Kelly.