RECOMBINATIONAL DOMINANCE. “Admixed populations will also produce many similar recombinant phenotypes at the same time, increasing the probability that recombinant “hopeful monsters” will establish true-breeding evolutionary lineages. Recombination is not the only (or even most common) process generating evolutionary novelty, but might be the most credible mechanism for sudden appearance of new forms.”
http://link.springer.com/article/10.1007/s11692-012-9209-0