Biology 1001A Lecture Notes - Lecture 18: Liger, Ploidy, Allopatric Speciation

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Lecture 18: cooperation & conflict; speciation: identify the criteria used by the biological, phylogenetic, and ecological. The biological species concept defines a species as a group of organisms that can successfully interbreed and produce fertile offspring. The phylogenetic species concept defines a species as a group of organisms bound by a unique ancestry. The ecological species concept defines a species as a group of organisms that share a distinct ecological niche: identify the limitations of the biological species concept. There are several problems associated with the biological species concept. One major problem is that even though the definition works for species that reproduce sexually, it does not deal as well with those species that asexually reproduce. With this approach to reproduction, whole groups of organisms in the biological kingdom are not within the conventional definition of species. These reproductive patterns can blur the definition of species.

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