السلام عليكم و رحمة الله
Remember that homology means similarity between two different creatures due to common ancestor - anatomically or genetically (or molecular) . Which means that a human and a bacteria should have less in common than between a human and a chimp. The more unsimilar you are the further away the common ancestor between the two is and the more similar you are, the more recent your common ancestor is. Homology is used every time among evolutionist to determine the split between two creatures. This is the standard method used by Charles Darwin himself - which is why he believed that the humans and chimps had common ancestor due to their similarity. How can you falsify such belief? All you have to do is to show high similarity between creatures that look nothing like each other genetically or show less similarity between two creatures that look alike genetically.
Here is an example to understand. Imagine a cat, bat and a bird. Based on Darwin's own method we just need to look and whoever looks similar had a recent common ancestor. Who is closer to the bird? The cat or the bat? It is obviously the bat. There is no question about it. Therefore the evidence of homology must point to high similarity between bat and bird and less similarity between cat and bird on the genetic level (because we already established that bat is more similar to bird than a cat - so anatomical homology should be in accordance to genetic similarity if homology is true). Yet to our surprise the genetic evidence contradicts the anatomical evidence. The cat is more similar to the bird than the bat. Sean B. Carrol said,
"...consider bats and birds, both of which have adaptations that enable flight. This superficial resemblance might imply that bats are more closely related to birds than they are to cats, which cannot fly. But a closer examination reveals that a bat's wing is far more similar to the forelimbs of cats... than to a bird's wing" [1]
So homology is contradicted and thus unreliable. At least that's what common sense dictates but evolutionist have their way out. This contradiction has it's own name called homoplasy (or convergent evolution - to sound too scientific). This means that similarity between unsimilar creatures is due to pure accident. It just happened to be similar. So homology contradicts homoplasy and homoplasy contradicts homology. Moreover you cannot falsify the data. It's either homology or homoplasy. If similarity can arise by pure chance then how exactly can we trust Darwin's own method? And since similarity and unsimilarity are both evidence for evolution then does homology or homoplasy have any real meaning? Despite the obvious contradiction between homology and homoplasy, they - the evolutionist - still use homology and homoplasy as if they don't contradict each other. Also how can you possibly know if something is homology or homoplasy? You can't. You simply make it up as you go along. If you want the alleged 99% similarity between apes and humans as homology then you say its homology and if you don't want to say that then say it's homoplasy.
Homology is really the method of forging your own ancestors. It has no real meaning behind it or scientific evidence. It's mere conjecture and imagination.
What I showed above is contradiction between anatomical and molecular evidence. But there is even a contradiction between molecular evidences.
Michael Lynch notes that a study, led by Wray (and others), showed similarities between genes and came with the date of 1.0 to 1.2 billion for the origin of major animal phyla.[2] But other works showed that the origin of major animal phyla is actually just 800 million years ago.[3] But other molecular evidence shows yet different stories. Lynch again notes that a study led by Ayala (and others) showed that the origin for the major phyla at 600-670 million years.[4] What that means is that even molecular evidence contradicts molecular evidence all the time. It was first assumed that all genes change at a constant rate but soon enough it was discovered that change occurs at an irregular rate: some fast, some slow.[5] An example would be histone protein which hardly changes and thus evolutionist will never use histone proteins[6] because then any creature would be our cousin and had recent common ancestor with us. That is bad because that would contradict the anatomical homology between chimps and humans. So here is evidence of molecular evidence contradicting molecular. Despite this blatant problems and unsolvable problems Lynch says,
"Given the substantial evolutionary time separating the animal phyla, it is not surprising that single-gene analyses yield such discordant results. Under such circumstances, the statistical noise associated with the substitution process leads to a high probability that phylogenetic analyses based on different molecules will yield different topologies. "[7]
Which simply means that whenever evolutionist want a data to suit them, they accept it and whenever they don't like it they refuse it with fairytale stories about quick change or some unknown event that changes everything. Also it means that different genes give different stories. (Topology in this context means trees)
But that's not all. There are genes that can't fit homology at all. Those genes are known as ORFan genes. Those genes are so unique they exhibit no similarity to any existing gene (that's why they are called orfan genes, which is orphan genes). Those ORFan genes are everywhere and evolutionist will not use those to make evolutionary trees since they won't fit the pattern they like. It is said that there 1000 ORFan genes in humans[8]. Get it? 1000 genes is equal to approximately 5-6% of our DNA. So how are we 99% or 98.5% or 97% similar to chimps? It's impossible. So add to the 5-6% the 2% alleged differences, you get 8% difference between humans and chimps - that is 92% similarity. No more 95% or above. No doubt more ORFan genes will be found and the alleged similarity will fade away. But the question is how does ORFan genes come to existence? It couldn't arise by gene duplication.[9] So where do they come from? Though there is no certain answer but some evolutionist claimed that ORFan genes came by a process called de novo. Which simply means once upon a time a junk gene existed[10]. This junk gene which is as good as a garbage bin changed as time went on and miraculously became functional and so unique. Yes garbage changed to purity and cleanliness by chance. This is how bad homology has become. It was believed that ORFan genes is impossible since homology/evolution doesn't predict that[11] but now it's flooding everywhere and anywhere. A false prediction.
Due to these problems you start to understand why ideas like the web of life, bush of life, forest of life etc come to rise. The tree of life as Dawkins once thought was true[12] has died. And the reason why there is even a tree, web or bush of life is because evolutionist assume that alleged similarity means common ancestor. If you stop assuming, you will have no tree, web or forest of life. What you will have is dots across the page, each dot representing sudden appearances of animals.
To summarise homology (also called "molecular evidence") is the method of forging your own ancestors. Remember the saying? The strong, the ones in power, writes history (i.e. lie about the past). It is happening in front of your eyes cloaked in a respected area of research called science. Homology "is still a funny word: in the context of proteins and genes, it makes sense only if we don’t think about it too deeply" and a "useless word"[13]
Here is another example when different body structure give you different stories. For example when Lucy was uncovered, the evolutionist believed that Lucy evolved into a Australopithecus africanus and then into you and me.
Here is another example when different body structure give you different stories. For example when Lucy was uncovered, the evolutionist believed that Lucy evolved into a Australopithecus africanus and then into you and me.
Why? Because the head of Lucy appeared more ape-like than africanus[14]. But then a discovery was made in Sterkfontein[15] which is of africanus which shows that its legs was more ape-like than Lucy's![16] So now the legs are giving a different story than the heads. Did Lucy's descendants revert back to apish-ness? If yes then how does that explain the alleged "human-like" head of africanus?
That is just an example of how different body parts (head and leg in this case) give different stories. Now africanus is thrown away as a side-branch dead end since they don't want it to put doubt on Lucy. Of course all these fake tree drawings are just fancy trees they like. It may well be true that Lucy's descendants reverted (that's if Lucy had human-like legs) since evolution is random. But that's one example.
In fact one author denied Lucy altogether[17]. His claim is obviously rejected but Clarke discovered an Australopithecus which was not knuckle-walking (Lucy was) and he believed that it evolved into humans thus throwing Lucy to an evolutionary dead-end. He said that his discovery "argues against the commonly held view that human... ancestor would have been long-armed and knuckle-walk[ing]..." and that it argued against the fact that humans and chimps are closely related[18]
This all happened in 2002. Who knows what happened next but that Lucy vs africanus is definitely an important example.
But taking this incident and reflect upon it, does homology really give a consistent story? Does it even give a story in the first place? Can fossil evidence even give a story? No. For example, here we have Lucy in all her glory, how do we know for sure that she evolved into humans? We don't know. What if she became a chimpanzee? What if she and her family went actually extinct without evolving like africanus, robustus etc? How do we know for sure what really happened? What if Lucy isn't Lucy[19]? What if Lucy became Homo naledi?[20] We will never know. Homology fails to help and homoplasy refutes homology.
Fairytales after fairytales.
Note: I wrote this for my friend. I prefer to keep my articles strictly about history.
و الله اعلم
Note: I wrote this for my friend. I prefer to keep my articles strictly about history.
و الله اعلم
References and notes
[1] Neil A. Campbell and Jane B. Reece, 8th edition, Biology, page 541 (emphasis is mine). It's a biology textbook.
[2] Michael Lynch, The Age and Relationships of the Major Animal Phyla, Evolution, Vol 53, No. 2 (Apr., 1999) pp. 319-325 (p. 319). For free access see http://www.indiana.edu/~lynchlab/PDF/Lynch90.pdf
[3] Douglas H. Erwin et al, The Cambrian Conundrum: Early Divergence and Later Ecological success in the early history of animals, Science, 25 November 2011, Vol.334(6059), pp. 1091-7. See http://science.sciencemag.org/content/334/6059/1091.full
[4] Michael Lynch, The Age and Relationships of the Major Animal Phyla, Evolution, Vol 53, No. 2 (Apr., 1999) pp. 319-325 (p. 320).For free access see http://www.indiana.edu/~lynchlab/PDF/Lynch90.pdf
[5] Simon Y. W. Ho and Sebastian Duchene, Molecular-clock methods for estimating evolutionary rate and timescales, Molecular Ecology (2014) 23, 5947-5965 (p. 5947). See https://www.ncbi.nlm.nih.gov/pubmed/25290107
[6] Ernst Mayr, 2002, What Evolution Is; Ibid, page 5951
[7] Michael Lynch, The Age and Relationships of the Major Animal Phyla, Evolution, Vol 53, No. 2 (Apr., 1999) pp. 319-325 (p. 323). For free access see http://www.indiana.edu/~lynchlab/PDF/Lynch90.pdf
[8] http://www.biologicinstitute.org/post/127163753549/something-borrowed-something-new-human-orphan
[9] Ruiz-Orera J et al. (2015) Origins of De Novo Genes in Human and Chimpanzee. PLoS Genet 11(12).
Gene duplication is a gene that is duplicated. So let's say for example you have gene which has the letters AAAA and you duplicate that to get another AAAA. So now you have two genes with the exact code. Then vision that the first gene changes and becomes AAAB whilst the other gene changes and becomes AAAG. There is 75% similarity between these two gene. That is exactly what gene duplication is, just longer codes.
[10] Christian Schlotterer, Genes from scratch - the fate of de novo genes, Trends in Genetics, Volume 31, Issue 4, 215-219.
For free access see http://www.cell.com/trends/genetics/pdf/S0168-9525(15)00034-7.pdf; Aoife McLysaght and Laurence D. Hurst,Open questions in the study of de novo genes: what, how and why, Nature Reviews Genetics 17, 567-578 (2016). See http://www.nature.com/nrg/journal/v17/n9/abs/nrg.2016.78.html
[11] Christian Schlotterer, Genes from scratch - the fate of de novo genes, Trends in Genetics, Volume 31, Issue 4, 215-219. For free access see http://www.cell.com/trends/genetics/pdf/S0168-9525(15)00034-7.pdf
[12] Richard Dawkins, 2009, The Greatest Show on Earth, Bantam Press chapter 10
[13] Ford Doolittle, The nature of the universal ancestor and the evolution of the proteome, Current Opinion in Structural Biology, Volume 10, Issue 3, pages 355-358. See https://www.ncbi.nlm.nih.gov/pubmed/10851188
[14] Mark Collard and Leslie Aiello, "From forelimbs to two legs" Nature 404 (March 23, 2000): 339-340
[15] Clarke and Phillip Tobias, "Sterkfontein member 2 foot bones of the oldest South African hominid" Science 269 (5223):521-524
[16] Lee Berger and Phillip Tobias, "A chimpanzee-like tibia from Sterkfontein, South Africa and its implications for the interpretation of bipedalism in Australopithecus africanus" Journal of Human Evolution, April 1996, Vol 30 (4):343-348
[17] Clarke, "Newly revealed information on the Sterkfontein Member 2 Australopithecus skeleton", South African Journal of Science 98, November/December 2002. 523-526
[15] Clarke and Phillip Tobias, "Sterkfontein member 2 foot bones of the oldest South African hominid" Science 269 (5223):521-524
[16] Lee Berger and Phillip Tobias, "A chimpanzee-like tibia from Sterkfontein, South Africa and its implications for the interpretation of bipedalism in Australopithecus africanus" Journal of Human Evolution, April 1996, Vol 30 (4):343-348
[17] Clarke, "Newly revealed information on the Sterkfontein Member 2 Australopithecus skeleton", South African Journal of Science 98, November/December 2002. 523-526
[18] Ibid, 526
[19] Because Lucy was discovered scattered across a hillside. The bones were not found together, therefore some came up with the idea of "family" rather than one person called Lucy. The reason why it was accepted as being one is because no two of the same bones were found therefore, most likely, the bones relate to one person but recently one bone of Lucy's backbone belongs to a baboon (https://www.newscientist.com/article/dn27325-baboon-bone-found-in-famous-lucy-skeleton/). So is Lucy a mixture of God knows what? Lucy lived with baboons? Why did not the baboons evolve since they all lived in the alleged harsh climate?
[20] Homo naledi never became a human since it coexisted with humans, its alleged age is 912 ka years old. See Mana Dembo et al, "The evolutionary relationships and age of Homo naledi: An assessment using dated Bayesian phylogenetic methods" Journal of Human Evolution 97 (2016) 17-26