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Reference.org
Biological constraints
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<p>Biological constraints are factors which make <a href="/facts/Population/ArxshNuB">populations</a> resistant to <a href="/facts/Evolution/Hj0qAaBk">evolutionary</a> change. One proposed definition of constraint is "A property of a trait that, although possibly adaptive in the environment in which it originally evolved, acts to place limits on the production of new phenotypic variants." Constraint has played an important role in the development of such ideas as <a href="/facts/Homology_(biology)/muctKlyT">homology</a> and <a href="/facts/Body_plan/TykqU5bY">body plans</a>. </p>