BIO 3147 Lecture Notes - Lecture 3: Pleiotropy, Whitespace Character, Sea Urchin
Document Summary
Embryologist vs geneticist embryologists argued that we should all be the same if we have the same components (genes, nucleus) Lots of different version, but learn this in detail later on. One end, usually the apical end, pinches together to form a wedge like structure. Different ways for a tissue to grow like in epithelial layers. Usually many different types of growth at the same time. More ecm on surface --> overall growth of embryo. Like committing suicide because the cell knows it is better. Nucleus then all the steps --> proteins etc. Where one of more possibilities are available for change. Neutral environment with no signals from the outside to tell the cell otherwise. If not told to do anything --> will become muscle cell. Stable change in the internal state of the cell. Both seem to work at different times in organisms. Have to be touching side to side (juxtaposition)
