BIO 3147 Lecture Notes - Lecture 2: Invagination, Cell Division, Delamination
Document Summary
Spermist vs ovist one of them contained a preformed human. More popular than epigenesis, especially in the religious. From amorphous non distinct shape to distinct shape. Saw tiny organisms, protists, bacteria, cells defined some things. In preformation people argued you just could not see the tiny organism inside. Drew cork, looked like honeycomb chambers which were called cellulie, decided to call the small units cells. Somatic body cells, germ cells that will become gametes. Kept improving microscope --> see the different components of the cell. Helped confirm the nuclear vs extra nuclear (cytosolic) transmission of information. Co-founder of germ tissue (meso-, ecto-, endo- derm) Every embryo of a given form will not all do the same stages, branches off onto own specialization. Final embryo only looks like own type, not like other types. Thought the early embryos were the ancestral forms. There is no human embryonic stage that can function like a fish etc.
