When discussing form transformation, or morphological changes, it's important to understand genetic drift and reproductive isolation. Speciation is a
slow process - it doesn't happen overnight. Birds descendent from dinosaurs is a good example. The humming bird in my backyard does not look like
Tyrannosaurus Rex or an alligator in Okefennokee Swamp. Yet, they have a common ancestry.
"Alligators and birds are part of the same larger group, called archosaurs, which has existed for 250 million years and which has given rise not only
to birds and crocodilians, but also to dinosaurs. Though dinosaurs are now extinct, the crocodilians, such as alligators, crocodiles, and narrow-jawed
gharials live on, and scientists see in them many characteristics of the primitive archosaurs."
“It is a bit like building a house. You have the same bricks, the same tools, but buildings can come out differently,” Abzhanov said. “It’s
how and when you use these tools that’s important.”
And this: news.nationalgeographic.com...
"Now, for the first time, scientists have obtained partial protein sequences from the soft tissue remains.
"The sequences are clearly from T. rex," said John Asara of Harvard Medical School in Cambridge, Massachusetts, who led one of the studies.
In addition, both studies found similarities between the dino sample and the bone collagen of chickens, providing molecular support for the hypothesis
that modern birds are descended from dinosaurs.
Until now the dino-bird connection has been entirely based on physical similarities in fossils' body structures (related: "Earliest Bird Had Feet Like
Dinosaur, Fossil Shows" [December 1, 2005]).
In a related study, a team led by Mary Higby Schweitzer of North Carolina State University conducted tests that also revealed the presence of collagen
in the T. rex remains.
In one experiment, antibodies that normally react in the presence of chicken collagen reacted strongly to the dinosaur protein, suggesting a similar
For the protein sequencing study, Asara's team isolated seven fragmentary chains of amino acids—the building blocks of proteins—from the T. rex
The results are by far the oldest such data ever recovered. Previously, the earliest protein sequence data came from a 300,000-year-old mammoth
Asara's team extracted the amino acids using a highly refined version of the analytical technique known as mass spectrometry. "
And this: www.science20.com...
"Dinosaurs aren't extinct; there are about 10,000 species alive today in the form of birds. We wanted to understand the evolutionary links between
this exceptional living group, and their Mesozoic relatives, including well-known extinct species like T. rex, Triceratops, and Stegosaurus," said Dr.
Roger Benson of Oxford University's Department of Earth Sciences and leader of the study. "We found exceptional body mass variation in the dinosaur
line leading to birds, especially in the feathered dinosaurs called maniraptorans. These include Jurassic Park's Velociraptor, birds, and a huge range
of other forms, weighing anything from 15 grams to 3 tonnes, and eating meat, plants, and more omnivorous diets."
It's no mystery why different species have developed very different morphologies. We know from genetic sequencing and protein sequencing that these
very different-appearing creatures have a common ancestry. At some genetic level, all organisms, including humans, have common genetic ancestry. The
genetic code for an amino acid in a bacterium is exactly the same in humans.
The number of common factors amongst all living creatures on this planet is proof enough to validate evolution from common ancestry. Whether you call
it shape, form or morphology - it's exactly the same thing.
edit on 9-5-2014 by Phantom423 because: (no reason given)