BIOC19H3 Study Guide - Recapitulation Theory, Microscope, Ernst Haeckel
Document Summary
Regulation of gene expression underlies morphological changes seen in development. Example: the gene hmga2 is a key gene regulating height in people. Although its exact mechanism remains unknown, it is thought to increase cell production. But, many genes work together to achieve a morphological trait, including height: development occurs outside the female, externally, chickens are laying eggs all the time, no problem obtaining eggs. Artifact is a structure not naturally present in the sample being observed that arises during tissue preparation. The study of the developing animal from the fertilized egg right through to the adult stage. Study of the development of speci c tissue (e. g. formation of blood cells) Morphological level (how the tissue looks as it develops, change in gene expression) Detailed anatomical drawings made using the naked eye. Invention of the compound light microscope depend on: Advances made with the light microscope: advances in glass making techniques (for lens development and improvement, proper specimen preparation, fixation:
