Initiation of nervous system development in amphibians occurs when organizer cells
A) block BMP proteins from inducing ectoderm to become epidermis.
B) activate BMP proteins to induce ectoderm to become neural tissue.
C) block Goosecoid from inducing ectoderm to become epidermis.
D) block BMP proteins from inducing mesoderm to become epidermis.
E) activate BMP proteins that induce mesoderm to form dermis.

Question

Quizplus · Accepted Answer

Organizer cells in amphibians secrete chordin and noggin, which block the action of BMP (bone morphogenetic protein) molecules that would otherwise direct ectodermal cells to become epidermis. This results in the formation of a neural plate, which will give rise to the nervous system.

Initiation of Nervous System Development in Amphibians Occurs When Organizer