Phylogenetics and Speciation Concepts

These flashcards cover key concepts related to phylogenetics, reproductive isolation, and speciation.

Phylogenetics species concept

Defines species as the smallest grouping of individuals on a phylogeny.

Reproductive isolation

A biological barrier that impedes two species from producing viable, fertile offspring.

Prezygotic barriers

Reproductive barriers that occur before fertilization.

Postzygotic barriers

Reproductive barriers that occur after fertilization.

Habitat isolation

A form of prezygotic isolation where species occupy different habitats.

Temporal isolation

A form of prezygotic isolation where species breed at different times.

Behavioral isolation

A form of prezygotic isolation where species have different courtship rituals.

Allopatric speciation

Speciation that occurs due to geographic separation.

Sympatric speciation

Speciation that occurs without geographic separation.

Reduced hybrid viability

A postzygotic barrier where the genes of different parent species may impair the hybrid's development or survival.

Reduced hybrid fertility

A postzygotic barrier where hybrids are sterile.

Hybrid breakdown

A postzygotic barrier where first-generation hybrids are fertile, but their offspring are feeble or sterile.