BIOC19H3 Lecture Notes - Housekeeping Gene, Genetically Modified Organism, Recapitulation Theory
Document Summary
Developmental biology can be studied at 2 levels morphological level and molecular level (slide 8) * gene expression controls animal development. * changes in gene expression can affect morphological changes example: hmga2 gene controls human height, changes to this gene can cause abnormally tall humans or very short humans. Advances in developmental biology (slide 12: phase 1, phase 2, phase 3, phase 4, phase 5: During the ancient times observation using the naked eye. Chicks were usually the ones who were observed. *chicken are chose because they develop externally (egg), the egg can be cracked at different times to see each stage. *cooling the egg down causes the development to slow down, which helps keep the chick at a certain stage. *the collection of human anatomical drawings were growing and they described the anatomy at different ages (humans) The invention of the compound light microscope depended on: advances in glass making techniques (for lens development and improvement, proper specimen preparation.
