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A gradual and sequential
change in
population characteristics over a geographical area without
significant break such as would justify division into separate
species. |
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A cline is a
series of contiguous
populations in a group of related
organisms, usually along a line of
environmental or geographic
transition, that exhibit gradual and continuous change of
character between two extreme in response to some environmental
gradient.
Continuous series of differences in
function or
structure
(phenotype) displayed by members of a
species over a
geographical area along a line that extends from one end of
their range to another. The change in phenotype does not result
in different species as long as the geographically spread
populations can
interbreed with one another. |
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