CREDIBLE HYBRID SPECIATION. “Recent empirical and theoretical research on hybrid speciation might have revived the hopeful monster in a new, more credible form. Recombination of parental chromosomes in the F2 and later generations during hybridization can generate genotypes that express phenotypes outside the normal range of variation observed in either parental gene pool, a phenomenon termed “transgressive segregation”.”
http://link.springer.com/article/10.1007/s11692-012-9209-0