12 Flashcards
Has always been a major force in macroevolution
Extinction
Wave of speciation that occurs as a new habitat is colonized by lineage, or in the wake of the extinction of another lineage
Adaptive radiation
Occurs when two different species share a common ancestor but have different characteristics from one another
Divergent evolution
Occurs when two different species do not share a common ancestor but have developed similar characteristics through adaptation to similar environmental conditions
Convergent evolution
Are similar because of common ancestry had that structure
Homologous Structures
Performs a similar function in different organisms but is not shared by a common ancestor
Analogous Structures
Homologous structures are due to ..
Divergent evolution
Natural selection causes distantly related organisms with no common ancestor to evolve analogous structure
Convergent evolution
Process in which one species splits from another, the emergence of a new species
Speciation
Sum of all the alleles found in a species
Gene Pool
Two closely related species of Caribbean Corals in the same area that are re-productively isolated by minor differences in habitat
Ecological Isolation
The presence of extra sets of chromosomes due to accidents during cell division
Polyploidy