Reply to post: I was taught...

Forget Sesame Street, scientists pretty much watched Big Bird evolve on Galápagos island

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I was taught...

that for speciation to be considered complete, it required genetic incompatibility, not simply habitual mating practice. My tutor was of the opinion that so-called 'lock and key' mechanisms were obviously strong contributors to speciation, but because populations could re-converge and re-hybridise, they did not satisfy the proper conditions for speciation. The 'lock-and-key' hypothesis is best exemplified by reference to the erm... 'physical' compatibility or not of the erm... anatomical components required to effect gamete transfer. Indeed some of the videos I've seen on the internet would suggest that can happen in Homo sapiens as well. As for the IT angle... have you ever tried jamming a USB cable into a Firewire port?

The professor I had for Evolutionary Biology was John Maynard Smith, by the way,

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