|MadSci Network: Evolution|
Hello! A debate I had a while ago sparked an idea - but first, here is what I understand to be the definition of a species: Two individuals (of opposite sexes) can be said to be of the same species only if they are able to reproduce naturally, and their offspring are not sterile. The idea was that if the definition of a species is contained within that sentence, the animals we call dogs are not really all of the same species - Due to the sheer difference in size, I can not imagine a Chihuaua and an Irish Wolf Hound naturally producing offspring... Is my thinking correct (if so, the splitting of the dog breeds into separate species would be a valid example of evolution on macro scale)? When can we say that two populations formed by splitting a population of a single species have genetically drifted apart enough to call them separate species?
Re: How to define a species?
Try the links in the MadSci Library for more information on Evolution.