Earth Sciences 1083F/G Lecture Notes - Lecture 6: Hydrosphere, Geosphere, Neoteny
12 Sep 2016
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Document Summary
Tricking the clock: some quirks of heterchrony and. Toys with the machinery in an organism that is a result of evolution. With our developmental history, we are looking at our evolutionary history: went from looking like a fish to a reptile to a mammal as the fetus. Embryonic development was a record of an organism"s past evolutionary history. Evolution would add changes to the adult stages of development in an organism"s life cycle. Previous adult stages would be pushed backwards in developmental time in an organism"s life cycle as new ones were added developing. But he was wrong: organisms don"t truly repeat their ancestral stages, has more to do with timing and rate of development of characters in a basic body plan (elaboration on a theme). If you want to study evolution, then you have to study the earliest form of the particular organism. This does not truly record a species evolutionary history.
