Mosaic evolution (or modular evolution) is the concept that evolutionary change takes place in some body parts or systems without simultaneous changes in other parts. Another definition is the `evolution of characters at various rates both within and between species`.408 Its place in evolutionary theory comes under long-term trends or macroevolu.....
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http://en.wikipedia.org/wiki/Mosaic_evolution
the occurrence, within a given population of organisms, of different rates of evolutionary change in various body structures and functions. An ... [2 related articles]
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http://www.britannica.com/eb/a-z/m/125
A pattern of evolution where all features of an organism do not evolve at the same rate. Some characteristics are retained from the ancestral condition while others are more recently evolved.
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https://www.encyclo.co.uk/local/21571
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