Despite their close geographical origins, these two biotypes rarely interbreed.
These taxa are able to interbreed with varying degrees of success.
This husbandry coincided with attempts to introduce new species from abroad, which might be interbred with domestic animals to increase their efficiency and usefulness.
Here we ask, are the populations represented by these samples freely interbreeding?
Molecular distances among the races are trivial although in some cases the ability to interbreed has been lost.
The sibling species are morphologically identical, do not interbreed in the wild and are characterized by markedly different behaviour.
Wells's early foray into genre interbreeding would later form a major plank in his twentiethcentury aesthetic platform.
Many questions remain disputed with regard to the exact nature of biotypes, especially their degree of genetic isolation and whether interbreeding occurs when two of them are brought into sympatry.
