Who needs males when you have parthenogenesis? With a little help from science, biologist Peter Baumann and collagues have created an all-female lizard species:
Researchers have bred a new species of all-female lizard, mimicking a process that has happened naturally in the past but has never been directly observed.
“It’s recreating the events that lead to new species,” said cell biologist Peter Baumann of the Stowers Institute for Medical Research, whose new species is described May 3 in the Proceedings of the National Academy of Sciences. “It relates to the question of how these unisexual species arise in the first place.”
I was sure they speculated that X0 was a precursor to XY.
I don't know, I got it from the Howard Hughes Medical Institute's DVD on sex-determination and it's been a while since I watched it.
http://www.hhmi.org/biointeractive/gender/lectures.html
A few years ago I managed to get them to send me all of their DVDs, like 20 of them and I'm not even a US resident. All I had to do was fill out the form on the website.
Of course cloning is not very adaptive