just because one monkey began the long-line towards humanity doesn't mean the other monkeys were't perfectly well-fit for their environment.
evolution starts in individuals. one individual of a species having an advantage does NOT mean all the other monkeys will die out.
this is either dishonesty or an utter lack of understanding of Evolution.
Originally Posted by Tucker Case (Evolution)
When I was still majoring in physics, quasar observation through gravitational lenses was my main area of interest (even though I hadn't really gotten that far in my formal studies before switching majors, I spent countless hours researching that stuff on my own time, proving that I am the ultra-nerd!).
I just had to go look those up, COOL!
Last edited by winston53660; 08-18-11 at 10:24 PM.
Just because the function of the eye develops in one lineage, this does not mean that a similar structure could not arise elsewhere. This is especially true when the gene9s) that controls eye formation and structures is shared by creatures as diverse as humans, fruit flies, and cephalopods (notably Pax-6 - discovered quite early on in the advent of genetic research in fruit flies).A separate yet convergent development is also supported when you look at the embryonic development of a cephalopod eye versus a vertebrate eye. The genes that control the development of the eyes for both cephalopods and invertebrates seems to have come from a basal ancestor to both invertebrates and mollusks (a cephalopod, and consequently a squid are both mollusks).
To trace the evolutionary changes that are potentially responsible for camera eye formation, we also compared octopus-eye ESTs with the completed genome sequences of other organisms. We found that 1019 out of the 1052 genes had already existed at the common ancestor of bilateria, and 875 genes were conserved between humans and octopuses. It suggests that a larger number of conserved genes and their similar gene expression may be responsible for the convergent evolution of the camera eye.
Same genes, with the same basic blueprint inherited from an ancestral lineage that are then expressed in a very similar fashion, although there are enough differences to point that they developed completely separate from each other.
From the same paper:
Comparative Analysis of Gene Expression for Convergent Evolution of Camera Eye Between Octopus and HumanAlthough the morphology of the ancestral eye cannot be inferred from this study, we were able to provide strong support for the hypothesis that these genes having had an important role in the function of camera eyes in both humans and octopuses were present in the last common ancestor of these two lineages. Taking this observation into account, we can reasonably contend that the convergent evolution of camera eyes is caused by the already-abundant presence of the commonly shared genes as the ancestral gene set and the remarkable similarity of expression profiles of their derived genes
So in summation.. we do not know the specifics, but there are shared genes that controls the development of the eye in the separate lineages, and they stem from a common ancestor - but here I am quoting from the paper, I will let it provide the summation:
Thanks for leading me to some fascinating information Celticwar. I am likely to spend some time over the next couple of days delving deeper into this, it touches on an area I have more than a passing interest in (not specifically cephalopods, I have had limited exposure to them and have not studied them all that much, but rather many of their marine invertebrate cousins). - This is not a damnation of evolution in the slightest however.Our results indicate that most of the genes, including several gene pathways necessary for the evolution of the camera eye, might be shared between human and octopus lineages. Therefore, there is strong evidence that the evolutionary mechanisms for the camera eyes of humans and octopuses are subjected to similar gene expression profiles of the commonly conserved gene set, although the developmental processes of the human and octopus eyes are a bit different.
edit.. somehow this got chopped - a picture to show how dissimilar embryonic eye development is between cephalopods and vertebrates:
Last edited by marduc; 08-18-11 at 10:40 PM.
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Speaking of evolution any one hear about this?
Fall From Grace
August 15, 2011
Readers of The Banner, the publication of the Christian Reformed Church in North America, reacted instantly to the news in January that two religion professors at Calvin College had written scholarly papers suggesting that evidence of genetics and evolution raised questions about the traditional, literal reading of Genesis about creation, the story of Adam and Eve, and the fall of humanity out of an initial idyllic state.
News: Fall From Grace - Inside Higher Ed
Treat the earth well: it was not given to you by your parents, it was loaned to you by your children. We do not inherit the Earth from our Ancestors, we borrow it from our Children. ~ Ancient American Indian Proverb