BIOL 180 Lecture Notes - Lecture 25: Comet Nucleus, Reproductive Isolation, Species
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Speciation is the formation of new and distinct species in the course of evolution: a splitting event that forms two or more distinct species from a single ancestral species, can occur abruptly or gradually. Adds branches to the tree of life, increasing biodiversity. In general, a species is defined as an evolutionarily independent population or group of populations. The three most common criteria used: the biological species concept. The go-to when it comes to identifying species is reproductive isolation. Ii) it cannot identify cryptic species which differ in traits other than morphology. Iii) the morphological features used to distinguish species are subjective; different researchers working on the same populations may disagree on the characters that distinguish species: the phylogenetic species concept. Identifies species based on the evolutionary history of populations: all about that monophyletic group: consists of an ancestral population.
