BIO SCI D103 Chapter Notes -Gene Expression, Hans Driesch, Signal Transduction

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Embryogenesis: the development of an embryo from the fertilized egg. First task = lay down overall body plan of the organism; different organisms solve this in several ways: embryology: the study of developmental biology, our understandings of the genetic control of development are most advanced in. Drosophilia melanogaster and caenorhabditis elegans: the study of developmental biology encompasses, development of the embryo, how animals can regenerate lost organs, development of sexual characteristics, control of post-embryonic growth, metamorphosis, aging. The origins of developmental biology: aristotle first defined the problem of epigenesis and performation, aristotle explained the development of an embryo with two possible explanations, performation theory of development: Offspring does not inherit its characteristics from the body of the parent, but only from the germ cells: characteristics acquired by the body during an animal"s life cannot be transmitted to the germ line. Two main types of development were originally proposed following the cell. Implies that cells must interact with each other.