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Sex and Death Chapter 5: The developmental systems alternative

Sex and Death Chapter 5: The developmental systems alternative. 5.1 Developmental Systems Theory –no privileged class of replicators Step 1: not only genes are inherited Step 2: genes are not determining traits Step 3: not only genes contain “information”

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Sex and Death Chapter 5: The developmental systems alternative

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  1. Sex and DeathChapter 5: The developmental systems alternative 5.1 Developmental Systems Theory –no privileged class of replicators Step 1: not only genes are inherited Step 2: genes are not determining traits Step 3: not only genes contain “information” Step 4: no exclusive role for genes in development Step 5: genes are not special molecules

  2. Sex and DeathChapter 5: The developmental systems alternative 5.2 epigenic inheritance and beyond: organism inherit - behavioral repertoires - epigenic inheritance systems - extracellular structures not only gens

  3. Sex and DeathChapter 5: The developmental systems alternative 5.3 the interactionist consensus: • all traits have both • genetic and • nongenetic causes, so genes cannot be separated as playing a determining role.

  4. Sex and DeathChapter 5: The developmental systems alternative • Genes are “context-sensitive difference makers” They produce their effects by adding a physical product to a complex network of causes consisting • of other genes and their immediate products • the other constitutes of the initial cell • all the inputs of materials and energy to the developing organism.

  5. Sex and DeathChapter 5: The developmental systems alternative 5.4 information in development: The causal notion of information: Information flows over a channel connecting two systems: - The receiver: the system that contains the information - The sender: the system that the information is about. When we can infer the state of the sender from the state of the receiver, then the systems are systematically causally related. However, in order to make sense of gene”s malfunctioning, an intentional notion of information is necessary.

  6. Sex and DeathChapter 5: The developmental systems alternative 5.4 information in development: The intentional notion of information: The relation between gene and organism is like the one between thought and thing. • Susan Oyama: The whole notion of developmental information should be abandoned the development in the embryo relies on cues in the developmental environment. There is no developmental plan within the embryo.

  7. Sex and DeathChapter 5: The developmental systems alternative • In any sense in which genes carry information, nongenetic developmental factors carry developmental information too.

  8. Sex and DeathChapter 5: The developmental systems alternative

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