When frog gender flips

With weed killer in the water, some males acquire female traits.

By Stephen Ornes, 00:00 AM March 23, 2010

Several months ago, a California college student working at a university laboratory checked up on a group of frogs and saw some unusual behavior. Some of the frogs were acting like females — which was unusual, since at the beginning of the experiment all of the frogs were males.

The student, Ngoc Mai Nguyen, says she told her boss, biologist Tyrone Hayes, “‘I don’t know what’s going on, but I don’t think this is normal.'” Nguyen, a student at the University of California, Berkeley, was work...

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