In this mode of speciation, something extrinsic to the organisms prevents two or more groups from mating with each other regularly, eventually causing that lineage to speciate.
All strains were individually incubated on V8 juice agar as described above to differentiate haploid fruiting from mating.
Of the 436 outcrossed progeny, 30 originated from mating between genets in different populations (6.88%), and 406 from mating between genets in the same populations (93.12%) (Table 1, Additional file 1).
Female sea otters often die from mating trauma.
The male's death may be a strategy for preventing other males from mating with the female.
"Younger bulls will try to run the females down, but the mature bulls prevent them from mating.
The goal is to prevent the first Bt-resistant Colorado potato beetle from mating with a second resistant bug, unleashing a new race of superbeetles.
Older rhinoceros bulls are known to keep younger bulls from mating with cows in their groups even after the elder males can no longer reproduce.
This genetic incompatability could be used to prevent synthetic yeast, released into the environment from mating with wild strains, Boeke says.
After mating, the males of some species smear a secretion over the epigynum, called an epigynal plug, that prevents the female from mating a second time.
Much of the history of civilisation has played out along sexual lines, from mating rituals to the notions of family, clan, tribe and nation.
