actually we do:
Archaea - Wikipedia
"The evolutionary relationship between archaea and
eukaryotes remains unclear. Aside from the similarities in cell structure and function that are discussed below, many genetic trees group the two."
"Complicating factors include claims that the relationship between eukaryotes and the archaeal phylum
Crenarchaeota is closer than the relationship between the
Euryarchaeota and the phylum Crenarchaeota
[73] and the presence of archaea-like genes in certain bacteria, such as
Thermotoga maritima, from
horizontal gene transfer.
[74] The standard hypothesis states that the ancestor of the eukaryotes diverged early from the Archaea,
[75][76] and that eukaryotes arose through fusion of an archaean and eubacterium, which became the nucleus and
cytoplasm; this explains various genetic similarities but runs into difficulties explaining cell structure.
[77] An alternative hypothesis, the
eocyte hypothesis, posits that
Eukaryota emerged relatively late from the Archaea"
Bacteria and archaea have a method of transferring genes to each other. They exist as a single cell and copy their DNA when they split, such that the offspring keep DNA that they picked up. In multicellular life, the cells responsible for producing gamete would have to have their genes changed to pass on information to offspring. Because our cells don't have that ability, it is impossible. That's why it would poke a big hole in evolution.
so what kind of example will falsified it?
Evolution can't be easily falsified. There are a few things that could really turn it on its head, but it would take a LOT of stuff to completely falsify it. If we take gravity as an example, it was once thought that gravity always pulled things toward Earth at 9.81 m/s/s. When we found that certain areas of high or low elevation had different acceleration rates, we didn't scrap the idea of gravity completely. We just realized that it actually depends on distance from the core and such. In the same way, we have a lot of evidence that we would still have to explain somehow, and finding genes that exist only in giraffes and squid would probably not convince people that there is not a process by which species change over time.
from the a rticle:
“The sex chromosomes are absolutely, completely different from all other mammals. We had not expected that,” says Jennifer Graves of the Australian National University in Canberra, who studies sex differentiation and is an author on the paper. Instead, the platypus Xs better match the avian Z sex chromosome. Another chromosome matches the mouse X, Graves and her colleagues report in Genome Research
Monotremes are the earliest to diverge from mammals. It makes sense that they would have some traits that resemble bird traits that other mammals do not have. When the lineage split into the monotremes and the theriiformes, theriiformes developed a slightly different sex chromosome. Monotremes never got this new sex chromosome. Therefore it is more similar to reptilian and bird chromosomes.
maybe this one will be more clear:
"The platypus shares with other mammals four genes associated with the zona pellucida, a gel-like coating that facilitates fertilization of the egg. But it also has two matches for ZPAX genes that had previously been found only in birds, amphibians and fish"-
so basically when we found the same genes from different groups in the same creature- we can claim for convergent evolution or a loss of genes between species.
We believe that a lineage of fish evolved into mammals. It does not contradict the theory of evolution to see a gene that exists in fish to also exist in mammals, UNLESS it doesn't exist in birds, reptiles, and amphibians. And even then, we could check to see if it was lost in all three of those. Now absent evidence of loss in all three we would have a problem, but that isn't the case here.
so evolution cant be falsified then. sorry.
like this one?:
http://phenomena.nationalgeographic.com/2013/01/01/how-a-quarter-of-the-cow-genome-came-from-snakes/
see above. we can always claim for any mechanism. known or unknowon.
Again, theories don't get falsified. Evidence causes them to change. If those changes become too extreme, then the theory may be scrapped. For example, we have no proof that the Earth orbits the Sun. It just involves a TON of wild assumptions and improbable scenarios to suggest otherwise.
so you see now that any finding can explain by evolution without any problem to the theory? so your claim about shared DNA between human and snake (but no other snimal)as evidence against evolution is wrong.
Viruses and even bacteria can cause genetic changes in reproductive organs. This study shows that there very well may be horizontal transfer of snake genes in humans. The important thing is that we do have ideas about how it happened in cattle. We can then make assumptions about things and test those assumptions. We can assume, for example, that it should be possible to observe gene transfer through ticks, so we can run a study. If we do observe it, then we can conclude that yes, it is likely that ticks caused this. If we fail to observe it, then we have to look at other ways it could happen. Once we've gotten to the point where we have no idea, that's when we start changing how we think evolution works.
its like claiming that human can get the ability to make a spider web by eating or from a bite of a spider. its need experimental evidence. and they dont have it.
Not that humans can get the ability to spin a web. That involves a lot of specialized organs and changes in anatomy. But if a human gametocyte (the cell that produces sperm or egg) were infected with a virus that had picked up spider DNA, then the offspring off that human would have that spider DNA. In all likelihood it wouldn't even do anything due to lack of other bits of DNA needed to make it work, assuming that it wasn't a strip of non-coding spider DNA to begin with.