Formerly About Advanced Micro Devices Message Board

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Politics : Formerly About Advanced Micro Devices

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To: combjelly who wrote (232267)	5/10/2005 10:30:45 PM
From: neolib	Read Replies (1) of 1573072

The old "Ontogeny Recapitulates Phylogeny". Umm, no. That has been successfully challenged a very long time ago. A fact that seems to have managed to avoid being included in highschool biology... Be careful. The idea that an embryo goes through the historical evolutionary progression is no longer held, but what is now held is that comparative embryology makes a very powerful argument for common descent. The basic body plans of a very wide range of related species shows similarities in fetus development that shed light on how our respective bodies are fashioned from the same basic genes. So the fourth embryo stage (pharyngula) when the Hox genes are patterning the major organs and body structure has a very remarkable pattern, the pharyngula arches in vertebrate embryos. This is the so called "gills" in human embryos, and indeed, the pharyngula arches form the gill structure in vertebrate fish, as well as facial, jaw, and ear structures in other vertebrates.

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