Biology 1001A Study Guide - Final Guide: Sympatric Speciation, Evolutionary Arms Race, Oxpecker
9 Dec 2016
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Criteria used by the morphological, biological and phylogenetic species concepts to define species: morphological: all individuals of a species share measurable traits. Uses morphological criteria and physical characters: biological: groups of inbreeding natural populations that are reproductively isolated from other groups are a species. Must produce fertile offspring under natural conditions: phylogenetic: uses both morphological and genetic sequence data. Weaknesses/limitations of these different species concepts: morphological: Thinks some individuals of same species are different b/c they look different. E. g. variation in shells of european garden snail. Does not distinguish some closely related species that look nearly identical. Tells us little about evolutionary processes: biological: Does not apply to many forms of life (asexual organisms) Ca(cid:374)"t (cid:271)e used to stud(cid:455) e(cid:454)ti(cid:374)(cid:272)t orga(cid:374)is(cid:373)s: phylogenetic: Detailed evolutionary histories have been described for relatively few groups of organisms. Not yet able to apply phylogenetic concept to all forms of life.
