<div dir="ltr">One thing that's always puzzled me about the standard abiogenesis narrative: how do unicellular creatures evolve into multi-cellular creatures with tissue differentiation, that also use gamete cells for reproduction that contain the DNA of all of the tissue types?<div><br></div><div>It's easy to see how you can go from unicellular creatures to colony creatures with tissue differentiation. And it's easy to see how you go from unicellular creatures reproducing via fission to unicellular creatures reproducing sexually.</div><div><br></div><div>The problem seem to be that, once you're a multi-cellular colony creature with differentiated tissues, it's very hard to see how you get the DNA from all the subspecies back into a single subspecies of gamete cell. Conversely, it's also difficult to see how, if you're a unicellular species that reproduces sexually, how to you accumulate and absorb other species for tissue differentiation?</div><div><br></div><div>Summing up, it's easy to see how one feature (tissue differentiation) or the other (gametes) evolves, but I've never heard an even remotely convincing narrative about how you end up with both features in one species.</div><div><br></div><div>Speculation: however it ended up happening, I strongly suspect it's the single innovation that caused the Cambrain explosion. And given how late the Cambrian explosion was in our planet's prehistory, it may have been a seriously difficult hump for evolution to get over. And may therefore be a prime candidate for the Great Filter.</div><div><br></div><div> </div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Sep 14, 2018 at 1:27 PM, Henrik Ohrstrom <span dir="ltr"><<a href="mailto:henrik.ohrstrom@gmail.com" target="_blank">henrik.ohrstrom@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Bats and moths have evolved together, probably starting with normal sounds for both and escalation and arms race as the logical result.<div>If it was a case of intelligent design we would se the usual signs of a design committee, inside out retinas, brains rotated and mirrored, air and fluid pathways crossing each other and so on. </div><div>/Henrik<br><br><div class="gmail_quote"><div><div class="h5"><div dir="ltr">Den fre 14 sep. 2018 19:59Dave Sill <<a href="mailto:sparge@gmail.com" target="_blank">sparge@gmail.com</a>> skrev:<br></div></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5"><div dir="ltr"><div class="gmail_quote"><div dir="ltr">On Fri, Sep 14, 2018 at 12:25 PM William Flynn Wallace <<a href="mailto:foozler83@gmail.com" target="_blank">foozler83@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div style="font-family:comic sans ms,sans-serif;font-size:small;color:#000000">Here's what I don't get about evolution: a tiger moth developed the ability to make ultrasonic clicks, which just so happen to interfere with a bat's ability to locate them.</div><div style="font-family:comic sans ms,sans-serif;font-size:small;color:#000000"><br></div><div style="font-family:comic sans ms,sans-serif;font-size:small;color:#000000">Doesn't that seem suspicious to you, like someone is messing with the system? random mutation is random, right? 'Just so happens' - seems like a huge coincidence to me.</div></div></blockquote><div><br></div><div>Not at all. Probably started with some mutation that caused minor, mostly ineffective clicking, but was effective enough to slightly enhance its owner's chances of reproducing. Over time, those moths whose clicking was more effective out-competed the others, and the "skill" was refined.</div></div></div><div dir="ltr"><div class="gmail_quote"><div><br></div><div>-Dave</div></div></div></div></div>
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