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iBlue
May 25, 2007, 05:33 AM
wow

Female hammerhead sharks can reproduce without having sex, scientists confirm.

The evidence comes from a shark at Henry Doorly Zoo in Nebraska which gave birth to a pup in 2001 despite having had no contact with a male.

Genetic tests by a team from Belfast, Nebraska and Florida prove conclusively the young animal possessed no paternal DNA, Biology Letters journal reports.

The type of reproduction exhibited had been seen before in bony fish but never in cartilaginous fish such as sharks.

Parthenogenesis, as this type of reproduction is known, occurs when an egg cell is triggered to develop as an embryo without the addition of any genetic material from a male sperm cell.

...More... (http://newsvote.bbc.co.uk/1/hi/sci/tech/6681793.stm)

http://newsvote.bbc.co.uk/1/hi/sci/tech/6681793.stm

Nature finds a way.

psychofreak
May 25, 2007, 05:40 AM
That's pretty koolio...

Abstract
May 25, 2007, 06:01 AM
Will males really not be needed?

PlaceofDis
May 25, 2007, 06:03 AM
"nature finds a way"

ahhhh, memories of Jurassic Park. and indeed its true. :D
the adaptability of some species is just amazing.

bartelby
May 25, 2007, 06:04 AM
I love sharks!
They're incredible creatures, and they've just got even better!!

MacBoobsPro
May 25, 2007, 06:09 AM
I love sharks!
They're incredible creatures, and they've just got even better!!

Its not a good thing though as the article suggests. Its a bit like inbreeding and so the qualities of the animal will diminish. I.e. its ability to destroy new viruses etc.

iBlue
May 25, 2007, 06:11 AM
Sharks are amazing. As I understand it, over millions of years they've evolved very little (especially in the case of great whites) because they're already so efficient as is.

edit: It does suggest a possible weakening of the offspring produced in this way but it's a fascinating development none the less.

PlaceofDis
May 25, 2007, 06:11 AM
Its not a good thing though as the article suggests. Its a bit like inbreeding and so the qualities of the animal will diminish. I.e. its ability to destroy new viruses etc.

very true, but however, it gives the species a greater survival rate though. say one lone female reproduces, gives the offspring a chance to find a male when the mother couldn't.

and well lets not forget that sharks are one of the oldest species on this planet.

bartelby
May 25, 2007, 06:12 AM
Its not a good thing though as the article suggests. Its a bit like inbreeding and so the qualities of the animal will diminish. I.e. its ability to destroy new viruses etc.

They've done well so far though, haven't they. I guess thay haven't just developed this ability...

RedTomato
May 25, 2007, 06:54 AM
very true, but however, it gives the species a greater survival rate though. say one lone female reproduces, gives the offspring a chance to find a male when the mother couldn't.

So now you have a young male, and an (older) female, swimming all alone together. What happens next? :rolleyes:


One other point: They said if the mother was genetic code AB, then the fatherless male would be either AA or BB (that's how I read it.)

If it was AA and they both mated again, then the result would be either AA again or AB again.

So any grandchild would be a clone of either the father or the mother (who would also be the grandmother:) ). Is that right or am I oversimplifying it?

MacBoobsPro
May 25, 2007, 07:00 AM
So now you have a young male, and an (older) female, swimming all alone together. What happens next? :rolleyes:


One other point: They said if the mother was genetic code AB, then the offspring would be either AA or BB (that's how I read it.)

If it was AA and they both mated again, then the result would be either AA again or AB again.

So any grandchild would be a clone of either the father or the mother (who would also be the grandmother:) ). Is that right or am I oversimplifying it?

Your overcomplicating it... the baby is dead! :p

topgunn
May 25, 2007, 07:56 AM
Sharks are amazing. As I understand it, over millions of years they've evolved very little (especially in the case of great whites) because they're already so efficient as is.
Maybe now we know why they have changed so little.

MacBoobsPro
May 25, 2007, 07:59 AM
Sharks are amazing. As I understand it, over millions of years they've evolved very little (especially in the case of great whites) because they're already so efficient as is.

edit: It does suggest a possible weakening of the offspring produced in this way but it's a fascinating development none the less.

They also have their own 'cure' for cancer too. They tan like ourselves to avoid damage from the sun. :eek:

Abstract
May 25, 2007, 08:39 AM
Look, all this proves is that science is wrong, biology is dumb, and that God must be real for this to happen.

*cough*

SilentPanda
May 25, 2007, 09:13 AM
I think AppleGeeks.com (http://www.applegeeks.com) said it best...

GFLPraxis
May 25, 2007, 05:58 PM
So is the baby a clone of the parent then, having the same DNA?

localoid
May 25, 2007, 08:49 PM
If sharks are so smart then why do they live in igloos? :confused:

Counterfit
May 25, 2007, 10:48 PM
I think a few years ago, some scientists managed to get a mouse egg to fertilize itself, but that's a bit different.


Now, who wants to help me nail this new shark to a cross? :D
Hoo boy, I'm gonna pay for that one...

ErikCLDR
May 26, 2007, 07:05 PM
Yea, if it can reproduce itself, there is not going to be much genetic variation and as a result if this was to happen a lot then problems could occur.

BigPrince
May 26, 2007, 07:08 PM
I think a few years ago, some scientists managed to get a mouse egg to fertilize itself, but that's a bit different.


Now, who wants to help me nail this new shark to a cross? :D
Hoo boy, I'm gonna pay for that one...

mouse lay eggs?

RedTomato
May 27, 2007, 05:41 AM
mouse lay eggs?

Strangely enough, human females have eggs too. You should get out more :rolleyes:

BigPrince
May 27, 2007, 07:12 AM
sorry, i was thinking with a hardshell.

I had always remembered that 99% of mammals give live birth.

Macaddicttt
May 27, 2007, 12:06 PM
Not to be anal, but the Immaculate Conception refers to Mary's conception, that is a conceptioin without the stain of original sin, not Jesus'. So yes, the shark could be a new Jesus, but I'm afraid it was no Immaculate Conception, at least by strict definitions. :p ;)

RedTomato
May 27, 2007, 12:59 PM
Not to be anal, but the Immaculate Conception refers to Mary's conception, that is a conceptioin without the stain of original sin, not Jesus'. So yes, the shark could be a new Jesus, but I'm afraid it was no Immaculate Conception, at least by strict definitions. :p ;)

My understanding is that original sin does not apply to animals, so it was indeed an Immaculate Conception of Shark.

(I can't believe I'm having this conversation..)

Macaddicttt
May 27, 2007, 02:31 PM
My understanding is that original sin does not apply to animals, so it was indeed an Immaculate Conception of Shark.

(I can't believe I'm having this conversation..)

I guess technically that is correct, but then again, why would you title a thread with something so commonplace?

(Neither can I.)