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Scientists have successfully made fish grow "hands" instead of fins in an experiment that may reveal how animals transitioned to living on land instead of only in water.
To understand how fins may have evolved into limbs, a team of scientists led by Dr. José Luis Gómez-Skarmeta at the CSIC-Universidad Pablo de Olavide-Junta de Andalucía, in Seville, Spain, and his colleague Dr. Fernando Casares injected zebrafish with the hoxd13 gene from a mouse.
Researchers said that the hoxd13 gene, known to play a role in distinguishing body parts, codes for a protein that controls the development of autopods, a precursor to hands and feet and paws.
Researchers explained that a full 24 hours after extra copies of the gene were introduced to the embryos, fish whose cells had taken up the gene began developing autopods instead of fins. While they maintained growing for four days, they later died.
The group, led by Dr José Luis Gómez-Skarmeta of Spain’s CSIC-Universidad Pablo de Olavide-Junta de Andalucía in Seville, found that zebrafish injected with a mouse gene, hoxd13, developed leg-like limbs where fins should be. This indicates that the hoxd13 gene – which occurs in the fish, but at lower levels than in mice – helped drive the genetic changes that eventually become arms, legs, hands and feet.
There’s no hint that Dr Gómez-Skarmeta plans to try the same trick on sharks, thankfully.
It’s a pretty safe presumption that hands evolved from fins, since fish evolved long before anything remotely resembling an opposable thumb.
One full day later, all of those fish whose cells had taken up the gene began to develop autopods instead of fins. They carried on growing for four days but then died
Originally posted by Skywatcher2011
That picture was used to show what the hands would look like if they evolved from this experiment. Don't shoot the messenger, shoot the article publisher
Originally posted by Skywatcher2011
Originally posted by v0ice0freas0n
reply to post by iwan2ski
Evidence please? Other than "we can mess with genetics, so someone must have done it to us!"
We are not designed particularly intelligently.