Lecture 1 HO.ppt

Anatomical approach studying the changing anatomy of

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Unformatted text preview: ns addressed? Anatomical approach • studying the changing anatomy of an organism Experimental approach Genetic approach 2 Aristotle was the first developmental biologist! Wrote The Generation of Animals, 350 B.C., Aristotle described chicken embryo development Hen s eggs experiments • saw that embryo originates from simpler rudiments that grow in complexity •  noticed resemblances between parent and offspring • Described different ways animals are born: oviparity, viviparity, ovoviviparity • Identified 2 major cell division patterns in embryos: holoblastic and meroblastic cleavage • Identified function of placenta and umbilical cord Aristotle and Socrates School of Athens, 1510-1511 384-322 B.C. The 2000 year old debate: Preformation: The embryo is Which came first preformed from the beginning. The first embryo must contain all future The chicken or the egg? embryos. Epigenesis: The embryo originates from simpler rudiments that gradually increase in complexity to give rise to the adult form. The Homunculus Preformationism̶waste of life? 1632-1723 AntonVan Leeuwenhoek 
 discovered sperm Dutch microscopist •  invented microscope •  preformationist Prevailing views of early 1700 s •  No cell theory to provide lower limit to organism size •  Humankind exists between creation and resurrection Hartsoeker 16...
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