Anagenesis
Anagenesis, also known as "phyletic change", is the evolution of species involving an entire population rather than a branching event, as in cladogenesis. When enough mutations have occurred and beco...
Synapomorphy
In cladistics, a synapomorphy or synapomorphic character state is a trait that is shared ("symmorphy") by two or more taxa and inferred to have been present in their most recent common ancestor, whose...
Synapomorphy - Wikipedia
Proximate and ultimate causation
A proximate cause is an event which is closest to, or immediately responsible for causing, some observed result. This exists in contrast to a higher-level ultimate cause (or distal cause) which is us...
Proximate and ultimate causation - Wikipedia
Autapomorphy
In cladistics, an autapomorphy is a distinctive anatomical feature, known as a derived trait, that is unique to a given terminal group. That is, it is found only in one member of a clade, but not fou...
Autapomorphy - Wikipedia
Cephalization
Cephalization is considered an evolutionary trend, whereby nervous tissue, over many generations, becomes concentrated toward one end of an organism. This process eventually produces a head region wit...
Incipient speciation
Incipient speciation is the evolutionary process in which new species form but are still capable of interbreeding; it can be the first part of the larger process of speciation. Incipient speciation ca...
Variational properties
In evolutionary biology, the variational properties of an organism are properties that produce variation among its offspring. In a broader sense variational properties include phenotypic plasticity. V...
Evolutionary radiation
An evolutionary radiation is an increase in taxonomic diversity or morphological disparity, due to adaptive change or the opening of ecospace. Radiations may affect one clade or many, and be rapid or...
Hybrid speciation
Hybrid speciation is a form of speciation wherein hybridization between two different species leads to a new species, reproductively isolated from the parent species. From the 1940s, reproductive isol...
Hybrid speciation - Wikipedia
Evolutionary grade
In alpha taxonomy, a grade refers to a taxon united by a level of morphological or physiological complexity. The term was coined by British biologist Julian Huxley, to contrast with clade, a strictly ...
Evolutionary grade - Wikipedia
Adaptive value
The adaptive value represents the combined influence of all characters which affect the fitness of an individual or population.
Adaptive value is an essential concept of population genetics. It ...
Adaptive radiation
In evolutionary biology, adaptive radiation is a process in which organisms diversify rapidly into a multitude of new forms, particularly when a change in the environment makes new resources available...
Resource holding potential
In biology, resource holding potential (RHP) is the ability of an animal to win an all-out fight if one were to take place.The term was coined by Geoff Parker to disambiguate physical fighting ability...
Predictive adaptive response
A predictive adaptive response (PAR) is a developmental trajectory taken by an organism during a period of developmental plasticity in response to perceived environmental cues. This PAR does not confe...