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Evolution__3rd_Edition

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Developmental Biology<br />

20<strong>Evolution</strong>ary<br />

E volutionary developmental biology, now often known<br />

as “evo-devo,” is the study of the relation between<br />

evolution and development. The relation between evolution<br />

and development has been the subject of research for many<br />

years, and the chapter begins by looking at some classic ideas.<br />

However, the subject has been transformed in recent years<br />

as the genes that control development have begun to be<br />

identified. This chapter looks at how changes in these<br />

developmental genes, such as changes in their spatial or<br />

temporal expression in the embryo, are associated with<br />

changes in adult morphology. The origin of a set of genes<br />

controlling development may have opened up new and more<br />

flexible ways in which evolution could occur: life may have<br />

become more “evolvable.”<br />

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