Definitions for macroevolutionˌmæk roʊˌɛv əˈlu ʃən; esp. Brit. -ˌi və-
This page provides all possible meanings and translations of the word macroevolution
Random House Webster's College Dictionary
mac•ro•ev•o•lu•tionˌmæk roʊˌɛv əˈlu ʃən; esp. Brit. -ˌi və-(n.)
major evolutionary change of species and taxa.
Origin of macroevolution:
evolution on a large scale extending over geologic era and resulting in the formation of new taxonomic groups
Large-scale patterns or processes in the history of life, including the origins of novel organism designs, evolutionary trends, adaptive radiations and extinctions.
Macroevolution is evolution on a scale of separated gene pools. Macroevolutionary studies focus on change that occurs at or above the level of species, in contrast with microevolution, which refers to smaller evolutionary changes within a species or population. Contrary to claims by creationists, macro and microevolution describe fundamentally identical processes on different time scales. The process of speciation may fall within the purview of either, depending on the forces thought to drive it. Paleontology, evolutionary developmental biology, comparative genomics and genomic phylostratigraphy contribute most of the evidence for the patterns and processes that can be classified as macroevolution. An example of macroevolution is the appearance of feathers during the evolution of birds from theropod dinosaurs. Abrupt transformations from one biologic system to another, for example the passing of life from water into land or the transition from invertebrates to vertebrates, are rare. Few major biological types have emerged during the evolutionary history of life and most of them survive till today. When lifeforms take such giant leaps, they meet little to no competition and are able to exploit a plethora of available niches, following a pattern of adaptive radiation. This can lead to convergent evolution, where unrelated populations display similar adaptations.
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