ANTH 4040 Chapter : Biological Concept Of Species Origins Of Species
Document Summary
Biological concept of species, origin of species (1/22-2/3) It"s the unit of evolution: reproductive isolation protects a species (i. e. its gene pool) from hybridization with another species, natural selection leads to adaptations in a species to an ecological niche. The bounded gene pool prevents unwanted incursion of genes/alleles from other species not adapted to the same niche. Although hybridization with another species would increase genetic variability, hybridization would also disrupt adaptations. Ardipithecus ramidus was bipedal & had opposable big toe: diachronic-across time, may have 2 or more chronospecies (or paleospecies) within it, chronospecies: successively named species within a single evolving lineage. Identified by significant morphological change in the lineage overtime. Tempo: adaptive landscape is of rough topography, a species gene pool occupies a summit of a hill, genome consists of integrated complexes of gene. Principle force of evolution length of time to speciation.
