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| definition of a species as a population or group of populations whose members have the potential to interbreed in nature and produce viable, fertile offspring, but are not able to produce viable, fertile offspring with members of other populations | ||
| (G.G. Simspon). Species should be defined based on the separate evolution of lineages. | ||
| A definition of species in terms of ecological niche, the sum of how members of the species interact with the nonliving and living parts of their environment. | ||
| Each species is a population of an independently evolving lineage | ||
| prezygotic barrier between species; the species remain isolated because they breed in different habitats. | ||
| form of reproductive isolation in which two populations reproduce at different times | ||
| isolation between species caused by different behavioral patterns such as calls, signals, body language, and different rituals. | ||
| morphological differences can prevent successful mating | ||
| A prezygotic barrier in which male and/or female gametes die before uniting, or fail to unite | ||
| a type of postzygotic barrier between species; the species remain isolated because hybrid zygotes do not develop or hybrids do not become sexually mature | ||
| A type of postzygotic barrier between species; the species remain isolated because hybrids fail to produce functional gametes. | ||
| a type of postzygotic barrier between species; the species remain isolated because the offspring of hybrids are weak or infertile | ||
| The formation of new species in populations that are geographically isolated from one another. | ||
| the development of many different forms from an originally homogeneous group of organisms as they fill different ecological niches | ||
| Speciation through a branching mechanism whereby an ancestral population gives rise to two or more descendant populations. | ||
| evolution of a feature within a lineage over an arbitrary period of time. | ||
| the science of describing, naming, and classifying organisms | ||
| study of the diversity of organisms to classify them and determine their evolutionary relationships | ||
| Similarity in characteristics resulting from a shared ancestry. | ||
| similar (analogous) structure or molecular sequence that has evolved independently in two species | ||
| shared primitive characteristics | ||
| derived character shared by clade members | ||
| Pertaining to a taxon derived from a single ancestral species that gave rise to no species in any other taxa. | ||
| pertaining to a grouping of species that consists of an ancestral species and some, but not all, of its descendants. | ||
| Pertaining to a group of taxa derived from two or more different ancestors. | ||
| an animal phylum that has a notochord, a dorsal hollow nerve cord, and gill slits at some time in its life cycle | ||
| A vertebrate possessing two pairs of limbs, such as amphibians, reptiles, birds, and mammals. | ||
| Animals with backbones | ||
| A vertebrate possessing an amnion surrounding the embryo; reptiles, birds, and mammals are amniotes. | ||
| any warm-blooded vertebrate having the skin more or less covered with hair |
