evolutionary trend
evolutionary trend A steady change in a given adaptive direction, either in an evolutionary lineage or in a particular attribute (e.g. height of shoot). Such trends are often apparent in unrelated taxa. Formerly they were attributed to orthogenesis; now orthoselection or the contending theory of species selection are invoked. See also effect hypothesis.
evolutionary trend
evolutionary trend A steady change in a given adaptive direction, either in an evolutionary lineage or in a particular attribute, e.g. height of shoot. Such trends are often apparent in unrelated taxa. Formerly they were attributed to orthogenesis; now orthoselection or the contending theory of species selection is invoked.
evolutionary trend
evolutionary trend Steady change in a given adaptive direction, either in an evolutionary lineage or in a particular attribute, e.g. dentition. Such trends are often apparent in unrelated taxa. Formerly they were attributed to orthogenesis; now ortho-selection or the contending theory of species selection are invoked.
evolutionary trend
evolutionary trend Steady change in a given adaptive direction, either in an evolutionary lineage or in a particular attribute, e.g. dentition. Such trends are often apparent in unrelated taxa. Formerly they were attributed to orthogenesis; now orthoselection or the contending theory of species selection (effect hypothesis) are invoked.
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evolutionary trend