Evolution Vocab 2

Adaptive Radiation

The diversification of a group of organisms into forms filling different ecological niches.

Allopatric Speciation

The formation of new species as a result of geographic isolation.

Anagenesis

A gradual evolution of a species without branching.

Biological Species concept

Defines species based on their ability to reproduce and create viable offspring.

Cladogenesis

The branching evolution where a parent species splits into two or more distinct species.

Ecological Species Concept

Defines species based on their ecological niche and role in the environment.

Macroevolution

Large-scale evolutionary changes that occur over geologic time.

Morphological Sp. cnpt

Defines species based on observable physical traits.

Paleontological Sp. concept

Defines species based on their fossil record and morphological characteristics.

Phylogenetic Species cnpt

Defines species as the smallest group that shares a common ancestor.

Postzygotic barriers

Factors that prevent hybrid offspring from developing into viable, fertile adults.

Prezygotic Barriers

Factors that prevent mating or fertilization between species.

Punctuated Equilibrium

The theory that evolution occurs in rapid bursts followed by long periods of stability.

Reproductive Isolation

A collection of mechanisms that prevent species from interbreeding

Speciation

The process by which new species arise.

Species Selection

A concept where certain traits increase the likelihood of a species surviving over others.

Sympatric Speciation

The evolution of new species without geographic isolation.