1) Population 2) Universe 
A well-defined set of interacting individuals that compose a proportion of a larger, interbreeding population.
[n] - a population that is part of a larger population
subpopulation 1. A part or subdivision of a population; especially, one originating from some other population. 2. An identifiable fraction or subdivision of a population.
noun a population that is part of a larger population
a population that is part of a larger population