Adaptation and Natural Selection

Divergent natural selection

selection that acts in contrasting directions between two populations, usually with reference to ecological differences between their environments

Ecological speciation

a speciation process in which divergent natural selection drives the evolution of reproductive incompatibility

mutation-order speciation

a speciation process in which different and incompatible mutations fix in separate populations that are experiencing selective regimes

genomic island

a region of the genome where differentiation between populations is stronger than expected in the absence of divergent selection

natural selection

differential survival of classes of entities which differ in some characteristics

sexual selection

differential reproductive success of classes of entities which differ in some characteristics

reproductive isolation

genetically-based differences between populations which reduce or prevent genetic exchange between them

parapatric speciation

when a speciation event results in two geographically adjacent species