1. General introduction Part I. Methodological Issues: 2. How the choice of experimental organism matters 3. Unification and coherence as methodological objectives in the biological sciences Part II. Evolution: 4. 'Adaptation' 5. The influence of the evolutionary paradigm 6. 'Nothing in biology makes sense except in the light of evolution' (Theodosius Dobzhansky) Part III. Genetics and Molecular Biology: 7. On conceptual change in biology 8. Technique, task definition, and the transition from genetics to molecular genetics 9. Too many kinds of genes Part IV. Development: 10. Lillie's paradox - or, some hazards of cellular geography 11. On conflicts between genetic and developmental viewpoints 12. Reconceiving animals and their evolution.
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