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Definition: Equivalence of parts or organs of different organisms caused by evolutionary derivation from a corresponding pan or organ in a remote ancestor, and usually having a similar embryonic origin. May also refer to molecular (DNA, RNA, protein) sequences or chromosomes whose equivalence represents descent from a common ancestral molecule or chromosome, respectively. Serial homology is the correspondence in the same individual of repeated structures having the same origin and development, such as the appendages of arthropods.
Source: Hickman, C.P., et al. 2011. Integrated Principles of Zoology. Fifteenth Edition. McGraw-Hill Higher Education.