For the sake, however, of securing more descriptive terms, I will coin the words Apogamy and homogamy.
Isolation, then, is a genus, of which Apogamy and homogamy are species.
In the former case there arises homogamy, and in the latter case there arises Apogamy.
homogamy ho·mog·a·my (hō-mŏg'ə-mē)
Reproduction within a group that perpetuates qualities or traits that distinguish the group from a larger group of which it is part. Also called inbreeding.