how molecular phylogeny repeats antogeny
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Ontogeny recapitulates phylogeny" is a catchy phrase coined by Ernst Haeckel, a 19th century German biologist and philosopher to mean that the development of an organism (ontogeny) expresses all the intermediate forms of its ancestors throughout evolution(phylogeny).
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Recapitulation theory or biogenetic law was given by Ernst Haeckel. It states that an animal during its development (ontogeny) repeats certain ancestral stages of its evolution (phylogeny). Frog has a fish-like tadpole larva with gills and tail. This stage shows that frog has evolved from a fish-like ancestor.
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