I have a question for people who are well versed in evolution. It is often asserted by creationists that speciation does not take place. They ask for a single example of speciation happening and I can’t think of one in any kind of complex organism.
It occured to me that the various breeding experiments with fruit flies must have produced, at times, a viable new species. By that I mean one that could reproduce with its brood-mates but would be genetically unable to produce viable offspring with non-brood-mates separated by a few dozen generations.
Note that I said “genetically”. That means that the impediment should not simply be that fertilization is physically impossible. For example, a fruit fly might be bred with outsize sexual hardware, yet still be able (through artificial means) to fertilize the eggs of another line. (To be honest, I don’t know how fruit flies make whoopie, so maybe my objection is meaningless.) A physically incompatible fruit fly wouldn’t be a new “species” sufficient to answer the challenge of creationists; it would just be a morphological freak.
Also, we couldn’t consider flies produced by genetic engineering, since that would be, umm, “cheating” and in any case wouldn’t answer the assertion that a Biblical “kind” always reproduces without causing speciation. (Yes, I realize it’s not a single-generation thing.)
I hope I’ve explained the issue clearly enough. I have the feeling that an expert in evolution would have already recognized the issue I’m addressing and have a ready answer for me.
Anyway, can anybody cite a web address (or point to a book, or whatever) that gives an example of speciation by artificial selection?