Everything is virus: one of the theories of how cells went from RNA to DNA is viruses.
Comment on Evolution Factsberg
RandomStickman@fedia.io 3 weeks ago
My attempt at an explanation
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Ducks are dinosaurs: Ducks, as with all birds, evolved from theropods and are considered living dinosaurs.
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Horses walk on middle fingers: Ancestors of modern horses have 5 toes the size of a small dog. Eventually they evolved away the other toes and only the middle toe remain.
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Bees are crustaceans: Crustacea is not a single branch in the tree of life but a collection of multiple branches (i.e. paraphyletic). If we pick a point and said everything after that is considered the same group, then by necessity we have to put bees (and all hexapoda) and what we traditionally call crustaceans into a single group. That group would be pancrustacea. Is that exactly the same as saying bees are crustaceans? Are jackdaws crows? I'll let you decide.
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Pterodactyls are fish: Fish is also not a single branch. By the same token, if we want to put what we traditionally counted as fish (such as sharks, carps, and lungfishes) together as a single group, we have to include all vertebrates (which includes pterodactyls, us, whales, etc.)
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Redwood are algae: I'm not too sure about this one. The wikipedia page for algae say that it excludes the land plants (embryophytes) which redwoods are part of.
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Humans are part virus: Viruses have the ability inject and splice their genetic material into our genome and have our cells do the cloning for them. Usually it is not passed on to the next generation. Apparently an ancient strain of virus from millions of years ago incorporated themselves into our genome and our germ cells (sperm and egg) and can be passed on to the next generation.
deranger@sh.itjust.works 3 weeks ago
BurgerBaron@quokk.au 3 weeks ago
The latest puzzle: what the viroids doin’ in our guts? Nobody knows, we are only just realised they are widespread and not exclusive to flowers or whatever Anton told me. Tiny simple RNA smudges that are too simple to even qualify as a virus.
I feel like they’re as close to abiogenesis as we’ll ever get, with these living fossils.
bluestem@lemmygrad.ml 3 weeks ago
“Redwood are algae” is a similar statement to “Pterodactyls are fish” or “bees are crustaceans”. Redwoods are land plants, thus are also members of Viridiplantae - the clade containing land plants and green algae. The sister taxa to Viridiplantae in clade Archaeplastidia are Glaucophyta (unicellular algae), and Rhodaria (contains red algae among other things). Thus since land plants are more closely related to green algae than green algae is to red algae or glaucophytes, if we want to treat the term “algae” as a monophyletic clade, then we have to include land plants in that, which of course includes redwoods.
janus2@lemmy.zip 3 weeks ago
✳️❇️🦠🟢🟦🟢🦠❇️✳️ GLAUCOPHYTA MENTIONED
Rudee@lemmy.ml 3 weeks ago
Damn, how did the horse ancestors walk with toes the size of small dogs?
nialv7@lemmy.world 3 weeks ago
not just one. 5-8% of the human genome comes from viruses
whotookkarl@lemmy.dbzer0.com 3 weeks ago
wikipedia.org/wiki/Endogenous_retrovirus just in case anyone wants a search term
MalReynolds@slrpnk.net 3 weeks ago
And provides fertile ground for evolution by providing space for gene duplication and divergence. Likely also for miRNA control systems.
wonderingwanderer@sopuli.xyz 3 weeks ago
That explains a lot.