Preformationism
The doctrine that an organism exists fully formed in miniature within the egg or the sperm, and that development is merely the enlargement of a…
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The doctrine that an organism exists fully formed in miniature within the egg or the sperm, and that development is merely the enlargement of a…
Ernst Haeckel's claim that an embryo passes through the adult forms of its ancestors as it develops, summarised as the slogan that ontogeny…