BIO 102 Lecture Notes - Lecture 2: Carl Linnaeus, Railways Act 1921, Synapomorphy
26 Sep 2016
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: a type: morphological species concept: species is determined by its visible structural differences, such as feather or number of flower parts (linnaeus 1700"s) Useful when looking at fossils or preserved specimens: biological species concept: Consists of one or more populations whose members interbreed in nature to produce fertile offspring, and don"t breed with members of different species. Reproductive barriers keep a given species genetically distinct from other species. New species evolve when populations become reproductively isolated. Problems: sexually reproducing organisms cannot apply to non-living organisms: phylogenic species concept: Population is declared a separate species if it has undergone evolution long enough for statistically significant differences in diagnostic traits to emerge. Testable by comparing gene sequences between 2 groups. Many subspecies would become separate species under the phylogenic species concept. Biodiversity measurement involves determining the number of species and population size of each species a. Another estimate of biodiversity is the relatedness of the different species present in an ecosystem.
