Fig. 1
From: A Genetic Perspective on Eye Evolution: Gene Sharing, Convergence and Parallelism
Diagrammatic representation of the differences between homology and homoplasy. Arrows denote evolution. The left panel indicates that homologous structures (AC and AB) arise by divergence from a single ancestor (ABC) during evolution. The two right panels indicate that homoplasious structures may appear similar (ABC) either by independently recruiting the same element (C) by parallel evolution (middle panel) or by utilizing different elements (AB and C) and processes by convergent evolution (right panel). See text for further discussion