Evidence from Anatomy and Embryology, Evidence from the Cell

Evidence from Anatomy and Embryology, Evidence from the...

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Evidence from embryology Law of development (Von Baer: 1866) General traits appear first Specific traits appear later in development Development of all vertebrates is very similar If the theory of evolution is valid, then there should be evidence in embryological relationships
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http://www.visembryo.com/baby/i Principle of Recapitulation (Haeckel: 1866) Biogenic law “Ontogeny recapitulates Phylogeny” Ontogeny = individual development Recapitulates = repeats Phylogeny = evolutionary history
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Vertebrate Embryos
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Notice that in all embryos there’s a head-tail gradient; a right-left gradient, and a dorsal-ventral gradient established How are these gradients established??? Bicoid Hedgehog Semental genes Homeotic genes (HOX)
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Evidence from Comparative Anatomy If the theory of evolution is valid, then there should be evidence in anatomical relationships Test: Observe comparative anatomy Data: vertebrate morphological studies: Fore limbs Heart Gills and Lungs Bauplan = basic anatomical plan
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Evidence from Fore-limb Anatomy
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Evidence from Anatomy and Embryology, Evidence from the...

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