Macroevolutionary theories | definition of Macroevolutionary theories by Medical dictionary
macroevolution (redirected from Macroevolutionary theories)
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macroevolution (măk′rō-ĕv′ə-lo͞o′shən, -ē′və-)
Large-scale evolution occurring over a very long period time that results in the formation of new species and higher-level taxonomic groups.
mac′ro·ev′o·lu′tion·ar′y (-shə-nĕr′ē) adj.
macroevolution A term of art for large-scale evolution of ecologically separated gene pools, which occurs at or above the level of speciation, resulting in relatively large and complex changes such as anagenesis and cladogenesis stasigenesis.
macroevolution the collective processes by which new species arise and others become extinct.