This story taken from the National Geographic News in October 2008 includes the confirmation that certain mammals are able to fertilize their own eggs without the help of a mate. A shark in the Virginia Aquarium has proved that this was possible. Although the shark is not a survivor; before her death a DNA test was administered to find answers to questions that many had. The exam proved that the embryo only showed maternal genetic material. Scientists are trying to figure out the reason for self fertilization. Reproductive abnormalities are possible in a surviving embryo. Others might show signs of weak immune systems. Scientists do not know the actual cause of the mothers death but haven't ruled out her abnormal pregnancy.
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