homologous Having the same typical structure and position. In Biology homologous may refer to two anatomical structures or behavioral traits within different organisms which originated from a structure or trait of their common ancestral organism. The structures or traits in their current forms may not necessarily perform the same functions in each organism, nor perform the functions it did in the common Biology_glossary?id=8498&op=detail">ancestor. An example: the wing of a bat, the fin of a whale and the arm of a man are homologous structures.
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