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Development is the process through which an embryo becomes an adult organism and eventually dies. Through development, an organisms genotype is expressed as a phenotype, exposing genes to the action of natural selection.
Studies of development are important to evolutionary biology for several reasons:
Embryos image after an original by Michael Richardson et al.
Fruit fly images courtesy of Jean-Michel Muratet, Syndicat National des Ophtalmologistes de France (SNOF).
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Spanish translation of Understanding Evolution For Teachers from the Spanish Society of Evolutionary Biology.