Homology, Genes, and Evolutionary InnovationA major synthesis of homology, written by a top researcher in the field Homology a similar trait shared by different species and derived from common ancestry, such as a seal's fin and a bird's wing is one of the most fundamental yet challenging concepts in evolutionary biology. This groundbreaking book provides the first mechanistically based theory of what homology is and how it arises in evolution. Gnter Wagner, one of the preeminent researchers in