It's not impossible; the omnimal could do it if interbreeding had a high survival factor.
The interbreeding of these different classes of population resulted in creole types, characteristic of each region.
It is significant to point out that intermarriage or interbreeding between Fijians and Indians is relatively slight.
Yet interbreeding has doubtless been an important element in the elaboration of the stupendous caste organization.
Interbreeding of similar forms tends to make a stable stock; out-breeding among dissimilars tends to promote variability.
Darwin admits that different species of animals are differently affected by the same degree of interbreeding.
Here, then, we must look for the greatest evil effects from the interbreeding of the members of the varieties.
Interbreeding between members of the two lots of animals would, in consequence, be equivalent to crossing.
Allow the legs to be of proportionate size, and a marked decrease in the evil entailed by interbreeding will be observable.
With them, the more careful the selection, the greater are the evil effects of interbreeding.