31 Oct 13
2 edits
It was previously assumed that if two breading groups, that are in the process of genetically diverging from each other, interbreed, this interbreeding between the two groups would keep mixing the gene pools and act as a very significant barrier to prevent them genetically diverging and thus prevent speciation. Now new research shows that this is not necessarily the case and may often not actually be the case at all as well as showing that fewer genetic changes are required for speciation than was generally assumed:
http://phys.org/news/2013-10-evolution-species-requires-genetic.html