2E. Timing and Coordination of Events Affect Homeostasis

Students may not often consider timing as an important element in maintaining homeostasis.  Many students have not studied the embryological development of organisms as dependent upon sequential gene expression.  To help students see the link between timing sequences and correct embryological development are 6 required pieces of Essential Knowledge dealing with  importance of transcription factors.

  • homeotic genes
  • embryonic induction
  • germination of seeds
  • genetic mutations
  • genetic transplantation
  • microRnas

The integration of internal and external signals plays a significant role in coordination of an organism’s (plants, animals, fungus, protists and microbes) physiological processes.  In addition, looking through the lens of natural selection, students can investigate adaptive behaviors of organisms as a result of timing and coordination.


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