SLEIGHT OF HAND. “Alfred Sturtevant formulated the question of the GP map in simple terms: “one of the central problems of biology is that of differentiation – how does an egg develop into a complex many-celled organism? That is, of course, the traditional major problem of embryology; but it also appears in genetics in the form of the question, How do genes produce their effects?” (GP = genotype-phenotype relationship).
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