Terms : Hide Images
| 12069975840 | Speciation | The process of splitting one biological lineage into two biological lineages that evolve independently from one another. |  | 0 |
| 12069983370 | Extinction | The termination of an organism or of a group of organisms, normally a species. |  | 1 |
| 12070008277 | Reproductive isolation | Condition in which two divergent populations are no longer exchanging genes. Can lead to speciation. |  | 2 |
| 12070022372 | Adaptive radiation | The diversification of a group of organisms into forms filling different ecological niches. |  | 3 |
| 12070063677 | Species | The base unit of taxonomic classification, consisting of an ancestor-descendant group of populations of evolutionarily closely related, similar organisms. The more narrowly defined "biological species" consists of individuals capable of interbreeding with each other but not with members of other species. |  | 4 |
| 12070071747 | Pre-zygotic barrier | Barriers to the reproductive process that occur before the union of the nuclei of two gametes. |  | 5 |
| 12070082497 | Geographic isolation | A population of animals, plants, or other organisms are separated from exchanging genetic material with other organisms of the same species. |  | 6 |
| 12070107982 | Post-zygotic barrier | Barriers to the reproductive process that occur after the union of the nuclei of two gametes. |  | 7 |
| 12070116060 | Polyploidy | The possession of more than two entire sets of chromosomes. |  | 8 |
| 12070124670 | Gene flow | Exchange of genes between populations through migration of individuals or movements of gametes. |  | 9 |
| 12070132596 | Allopatric speciation | The formation of two species from one when reproductive isolation occurs because of the interposition of (or crossing of) a physical geographic barrier such as a river. Also called geographic speciation. |  | 10 |
| 12070142154 | Sympatric speciation | Speciation due to reproductive isolation without any physical separation of the subpopulation. |  | 11 |
| 12070146782 | Temporal isolation | Occurs when mating between two closely related species, with overlapping range, is prevented due to the difference in the time of sexual maturity―flowering in the case of plants. |  | 12 |
| 12070170834 | Behavioral isolation | Reproductive isolation based on the behavior of species in the context of mating rituals and signals. Also known as ethological isolation, it occurs when two populations are capable of interbreeding, but don't breed because of differences in their courtship rituals. |  | 13 |
| 12070204009 | Mechanical isolation | When differences in the reproductive organs of two species prevent interbreeding and thus, prevent the birth of a sterile hybrid. Even if the members of two different but closely related species attempt to copulate after successful courting, mating will not be successful. |  | 14 |
| 12070236338 | Hybrid | The offspring of two plants or animals of different species, such as a mule (a hybrid of a donkey and a horse). |  | 15 |
| 12070255558 | Gradualism | The hypothesis that evolution proceeds chiefly by the accumulation of gradual, or slow, changes (in contrast to the punctuationist model). |  | 16 |
| 12070307399 | "evo-devo" | Also known as evolutionary developmental biology. It is the study of the interplay between evolutionary and developmental processes, with a focus on the genetic changes that give rise to novel morphology. Key concepts of include modularity, genetic toolkits, genetic switches, and heterochrony. |  | 17 |
| 12070325333 | Punctuated equilibrium | The hypothesis that evolutionary development is marked by isolated episodes of rapid speciation between long periods of little or no change. |  | 18 |
| 12070347749 | Hybrid sterility | The inhibition or suppression of the reproductive. capacity of F1 or later generation hybrids between genetically different strains or populations, usually belonging to different species. |  | 19 |
