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  1. #1
    Atomic Punk ZeoBandit's Avatar
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    Default DNA test proves it -- baby shark has no father

    DNA test proves it -- baby shark has no father

    RICHMOND, Virginia (AP) -- Scientists have confirmed the second case of a "virgin birth" in a shark.

    In a study reported Friday in the Journal of Fish Biology, scientists said DNA testing proved that a pup carried by a female blacktip shark in a Virginia aquarium contained no genetic material from a male.

    The first documented case of asexual reproduction, or parthenogenesis, among sharks involved a pup born to a hammerhead at an Omaha, Nebraska, zoo.

    "This first case was no fluke," Demian Chapman, a shark scientist and lead author of the second study, said in a statement. "It is quite possible that this is something female sharks of many species can do on occasion."

    The scientists cautioned that the rare asexual births should not be viewed as a possible solution to declining global shark populations. The aquarium sharks that reproduced without mates each carried only one pup, while some species can produce litters of a dozen or more.

    "It is very unlikely that a small number of female survivors could build their numbers up very quickly by undergoing virgin birth," Chapman said.

    The medical mystery began 16 months ago after the death of Tidbit, a blacktip shark that had lived for eight years at the Virginia Aquarium & Marine Science Center in Virginia Beach. No male blacktip sharks were present during her eight years.

    In May 2007, the 5-foot, 94-pound shark died after it was given a sedative before undergoing a yearly checkup. The 10-inch shark pup was found during a necropsy, surprising aquarium officials. They initially thought the embryonic pup was either the product of a virgin birth or a cross between the blacktip and a male of another shark species -- which has never been documented, Chapman said.

    Tidbit's pup was nearly full term, and likely would have been quickly eaten by "really big sand tiger sharks" that were in the tank, Chapman said in a telephone interview from Florida.

    That is what happened to the tiny hammerhead pup in the Omaha case.

    "By the time they could realize what they were looking at, something munched the baby," he said of aquarium workers. The remains of the pup were used for the DNA testing.

    Virgin birth has been proven in some bony fish, amphibians, reptiles and birds, and has been suspected among sharks in the wild.

    The scientists who studied the Virginia and Nebraska sharks said the newly formed pups acquired one set of chromosomes when the mother's chromosomes split during egg development, then united anew.

    Absent the chromosomes present in the male sperm, the offspring of an asexual conception have reduced genetic diversity and, the scientists said, may be at a disadvantage for surviving in the wild. A pup, for instance, can be more susceptible to congenital disorders and diseases.

    The scientists said their findings offer "intriguing questions" about how frequently automictic parthenogenesis occurs in the wild.

    "It is possible that parthenogenesis could become more common in these sharks if population densities become so low that females have trouble finding mates," said Mahmood Shivji, one of the scientists and director of the Guy Harvey Research Institute at Nova Southeastern University in Florida.

    The DNA fingerprinting techniques used by the scientists are identical to those used in human paternity testing.

    Chapman, who is with the Institute for Ocean Conservation Science at Stony Brook, was assisted in the study by Beth Firchau of the Virginia Aquarium.

    Chapman and Shivji were on the team that made the first discovery of virgin birth involving the Nebraska shark.
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  2. #2
    Baluchitherium sisca's Avatar
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    name him jesus. y'know, like a tribute.
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    then ill build it from the mexican side. -my reply.

  3. #3
    Future's in the past....
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    Henry Wu: You're implying that a group composed entirely of female animals will... breed?
    Dr. Ian Malcolm: No, I'm simply saying that life, uh... finds a way.
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  4. #4
    Eruption te5150's Avatar
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    This does not bode well for males.

    Maybe down the road women will keep us around anyway. You know, to open pickle jars and step on spiders.

  5. #5
    Future's in the past....
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    Quote Originally Posted by te5150 View Post
    This does not bode well for males.

    Maybe down the road women will keep us around anyway. You know, to open pickle jars and step on spiders.
    Doesn't sound like it bodes well for females either.

    Spontaneous pregnancy anyone?
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  6. #6
    Baluchitherium
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    Quote Originally Posted by VanHalenRules View Post
    Doesn't sound like it bodes well for females either.

    Spontaneous pregnancy anyone?
    yeah but when we tell em to go fuck themselves they really can!
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  7. #7
    Gird your loins Daisy Hill's Avatar
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    12.13.17 @ 07:36 PM
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    Default

    That would surely f$ck up a perfectly good Jerry Springer episode

  8. #8
    Atomic Punk
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    05.31.14 @ 08:17 PM
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    There are a lot of species that can do this.

    They carry both activate male genitalia internally to fertilize themselves if there are no males around.

    It may be rare in this type of shark but it shouldn't be unexpected.
    "Nothing is ever what it seems but everything is exactly what it is." - B. Banzai


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  9. #9
    Baluchitherium loveevhsince79's Avatar
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    10.23.15 @ 04:49 PM
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    Quote Originally Posted by VanHalenRules View Post
    Henry Wu: You're implying that a group composed entirely of female animals will... breed?
    Dr. Ian Malcolm: No, I'm simply saying that life, uh... finds a way.
    Great job!! I was thinking of that exact line too when I read this article.
    Life may not be the party we hoped for, but while we are here we might as well dance.

    Live simply. Love generously. Care deeply. Speak kindly.

  10. #10
    Baluchitherium mistere's Avatar
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    The Second Coming: This Time, It's Personal.

    But seriously. Aren't these scientists just enabling deadbeat shark dads?

  11. #11
    Good Enough KRAMER5150's Avatar
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    just proves that they are the baddest ass species around and i love'em
    I used to wonder why he was grinning all the time(Michael Ian Black talkin about EVH on VH1 I love the 80's) but then i realized the reason he's grinning is because he's Eddie F*#king Van Halen

  12. #12
    Good Enough avhevhmashdlr's Avatar
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    03.10.14 @ 08:22 PM
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    Quote Originally Posted by VanHalenRules View Post
    Henry Wu: You're implying that a group composed entirely of female animals will... breed?
    Dr. Ian Malcolm: No, I'm simply saying that life, uh... finds a way.
    [On the House Un-American Activities Committee] "They'll nail anyone who ever scratched his ass during the National Anthem."- Humphrey Bogart
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    "Don’t forget! One sperm can ruin your whole day!"

  13. #13
    Baluchitherium Duke's Avatar
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    It's just another example of humans polluting the oceans.
    Clearly, at some point, a human tossed a turkey baster overboard.
    The Edge... there is no honest way to explain it because the only people who really know where it is are the ones who have gone over.
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    This next part could really confuse things. Let's stay focused. #asis

  14. #14
    Atomic Punk MF5150's Avatar
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    12.13.17 @ 06:40 PM
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    Quote Originally Posted by VanHalenRules View Post
    Henry Wu: You're implying that a group composed entirely of female animals will... breed?
    Dr. Ian Malcolm: No, I'm simply saying that life, uh... finds a way.
    LOL!

    Very philosophical from a guy that said:

    That is one huge pile of shit....

    and

    Must go faster....must go faster...
    My man, when you are fantasizing, don't go for attainable, you can get attainable at the local Applebee's. - Dave's Dreidel

  15. #15
    Future's in the past....
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    11.03.17 @ 01:35 PM
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    Quote Originally Posted by EvH_316_5150 View Post
    LOL!

    Very philosophical from a guy that said:

    That is one huge pile of shit....

    and

    Must go faster....must go faster...
    To this day, my favorite quote from him...

    John Hammond: All major theme parks have had delays. When they opened Disneyland in 1956, nothing worked!
    Dr. Ian Malcolm: But, John. If the Pirates of the Caribbean breaks down, the pirates don't eat the tourists.
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