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Science proves virgin birth by sharks can occur E-mail
Wednesday, 23 May 2007
Science proves virgin birth by sharks can occur
A team of research scientists have concluded that the evidence shows that female hammerhead sharks can reproduce without having normal sex.

The team from Belfast, Nebraska and Florida conducted genetic tests on the DNA of a dead pup produced by a female hammerhead shark at Henry Doorly Zoo in Nebraska in 2001, and found that there was no sign of any genetic makeup from a father of the species.


SharkThe scientists’ findings were reported in the Biology Letters journal and the research team was made up of researchers from Queen's University Belfast, the Southeastern University in Florida, and the Henry Doorly Zoo.

This “virgin birth” means of reproduction is known as parthenogenesis, and it occurs when an egg cell develops as an embryo without the addition of any genetic material from a male sperm.

The scientist think that because of dwindling shark numbers in the wild and an inability to find males to mate with the females may resort to parthenogenesis. However, they point out that this is likely to weaken populations still further because of the lack of new genetic material being introduced by male sharks.


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Last Updated ( Monday, 28 May 2007 )
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