Since the late 1800s—well before advances in genetics and molecular biology—developmental biologists have been studying the mechanisms through which a single cell divides into multiple cell types and gets arranged into tissues, organs, and the organism’s overall form (Gilbert 2013). Genetic knowledge and technologies [provide] a productive strategy to work towards teasing open the complexities of development. (Extracted from p. 1-3 of Nature-Nurture? No).
The first complication of this reason to look for genes is really a clarification.
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Whys To Look For Genes: Pros and Complications 