TLS Online TPP Program

#Question id: 7105


The "default model" for neural tissue formation states that

#Unit 5. Developmental Biology
  1. No mechanism is required to form nervous tissue in the embryo; it forms unless signals direct development of epidermal tissue.
  2. Neural tissue formation is the default state, such that special induction is required to form mesoderm, endoderm and epidermis, but not neurectoderm.
  3. Neurectoderm formation is inhibited by the BMP proteins present throughout the early embryo, and this inhibition is relieved by BMP antagonists from the organizer, such as chordin
  4. The induction of neural tissue is the default state in embryos, and all other inductions are special.