Lecture 10: Objective 3 explain why amphibian dorsal lip is referred to as the organizer and explain its role in neutral induction Flashcards
dorsal lip
refers to amphibian embryo, also called “organizer” because of its ability to stimulate the formation of a secondary body axis
refer to fig 5.10 in book
dorsal lip is where ____ occurs
what kind of cells are in the dorsal lip?
what happens to cell mass?
what happened in the experiment in which embryologists transplanted a dorsal lip to the inner cell mass?
involution
bottle cells
involution causes chordamesoderm bottle cells to form notochord
move under ectoderm, and induce formation of neural tube
endoderm will be turned upside down
brings future ectoderm all the way around, and pushes dorsal lip over ectoderm
what happened in the experiment in which embryologists transplanted a dorsal lip to the inner cell mass?
the chordomesoderm pushes the new transplant over the ectoderm, inducing a second notochord
2 embryos develop
conclusion: chordomesoderm = major conducter of
