When Alvy Singer and Annie Hall split up, he tells her a relationship is like a shark: “It has to constantly move forward or it dies. And I think what we got on our hands is a dead shark.”
A relationship that turns into a dead shark is common. A live shark that reproduces without a relationship, however, is uncommon. Yet there was a recent report of a virgin birth in an aquarium — a female shark having a baby without mating. A trick of nature called parthenogenesis.
“I love this word parthenogenesis,” David Page, an expert on sex evolution at the Whitehead Institute for Biomedical Research in Cambridge, Mass., told me. “It suggests knowledge, but what it stands for in this case is ignorance. Nobody has a clue how parthenogenesis works.”
When a hammerhead shark had a baby at an Omaha zoo, scientists at first thought she had mated with another species or stored sperm from years before. But then they decided there was no “male contribution,” as one put it.
Dr. Page may be biased in favor of male contribution, but he doubts females are ready to dispense with males. “It’s reproducing without sex, and reproducing with sex is something that’s been around on our planet for maybe a billion or a billion and a half years,” he said. “Even yeast cells, the cells that make your bread and beer and wine, reproduce sexually.”.......
http://freedemocracy.blogspot.com/2007/06/maureen-dowd-men-will-be-boys.html