Tala Ko

Virgin birth by shark confirmed

Posted on: Monday, 13 October 2008

♪ Oh, little tank in Stony Brook…
clipped from www.sciencedaily.com
Scientists have confirmed the second-ever case of a “virgin birth” in a shark, indicating once again that female sharks can reproduce without mating and raising the possibility that many female sharks have this incredible capacity.
Scientists did not even know that Tidbit was pregnant until after she unfortunately died and an autopsy (called a necropsy for animals) was performed. “Sadness turned to surprise during the necropsy when we found that she was pregnant,” Firchau said. “There were no male blacktips in the tank for the past eight years!”
The phenomenon of “virgin birth” occurs when a baby is conceived without male sperm having first fertilized the female’s eggs, and has been proven in some bony fish, amphibians, reptiles, and birds.
instead of uniting with similarly split chromosomes from sperm, as occurs in sexual reproduction, the mother’s set is paired with a copy of itself
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