Indhold: Introduction. What is evo-devo?. Development, cells and molecules. Natural populations. Mutation and developmental repatterning. Heterochrony. Heterotropy. Heterometry. Heterotypy. The integrative nature of repatterning. Mapping repatterning to trees. Adaptation, coadaptation and exaptation. Developmental bias and constraint. Developmental genes and evolution. Gene co-option as an evolutionary mechanism. Developmental plasticity and evolution. The origin of species, novelties and body plans. The evolution of complexity. Key concepts and connections. Prospects. Glossary. Appendix 1: A little bit of history. Appendix 2: Naming of genes and proteins. Appendix 3: Geological time. Appendix 4: Inferring evolutionary trees from comparative data