Spiznet
Thu, Jul-27-06, 06:16
FINALLY, CONCLUSIVE PROOF OF AAT!!! Humans descended directly
from fully-aquatic sharks!!!
http://www.livescience.com/animalworld/060726_fins_limbs.html
By Ker Than LiveScience Staff Writer posted: 26 July 2006
01:01 pm ET
The triangular shark fin that sends frightened swimmers
scrambling to shore is made using the same genes that help
form the arms and legs of humans, a new study reports.
Researchers found that about a dozen genes that help give rise
to a shark's median fins-those that run along its back and
belly-also determine where paired side fins will form on its
body. These genes are known to play important roles in the
development of paired limbs in humans and other land animals.
The genes come from an ancient ancestor shared by sharks
and humans.
"It shows that this genetic program for building limbs has its
origins in the median fin structures of very early
vertebrates," or animals with backbones, study leader Martin
Cohn of the University of Florida told LiveScience.
The study, detailed in the July 27 issue of the journal
Nature, also found that the genes are vital for the formation
of the ribbon-like fins on the back of lampreys, a primitive
jawless fish that does not have paired side fins.
Sharks and lampreys belong to groups of fish that diverged
many millions of years ago, so the new finding suggests genes
important for the development of fins, and eventually limbs,
were in place long before the different kinds of fishes
evolved and went their separate ways.
from fully-aquatic sharks!!!
http://www.livescience.com/animalworld/060726_fins_limbs.html
By Ker Than LiveScience Staff Writer posted: 26 July 2006
01:01 pm ET
The triangular shark fin that sends frightened swimmers
scrambling to shore is made using the same genes that help
form the arms and legs of humans, a new study reports.
Researchers found that about a dozen genes that help give rise
to a shark's median fins-those that run along its back and
belly-also determine where paired side fins will form on its
body. These genes are known to play important roles in the
development of paired limbs in humans and other land animals.
The genes come from an ancient ancestor shared by sharks
and humans.
"It shows that this genetic program for building limbs has its
origins in the median fin structures of very early
vertebrates," or animals with backbones, study leader Martin
Cohn of the University of Florida told LiveScience.
The study, detailed in the July 27 issue of the journal
Nature, also found that the genes are vital for the formation
of the ribbon-like fins on the back of lampreys, a primitive
jawless fish that does not have paired side fins.
Sharks and lampreys belong to groups of fish that diverged
many millions of years ago, so the new finding suggests genes
important for the development of fins, and eventually limbs,
were in place long before the different kinds of fishes
evolved and went their separate ways.