What is a species?
The range of genes and all their alleles present in a population
Genepool
An organism resulting from the interbreeding of two different species
Hybrid
A definition of species based on physical characteristics
Morphological species
A group of actual, or potentially interbreeding natural populations that are reproductively isolated from other populations
Biological Species
Species that is based on the smallest group of individuals having a common ancestor, often determined through genetic analysis
Phylogenetic species