Experiments on amphibian embryos have shown that the notochord secretes Chordin and Noggin.If you performed an experiment in which you blocked the production of Chordin and Noggin in the early embryo,the expected result would be an embryo
A) that did not gastrulate.
B) that formed two embryos,joined belly-to-belly.
C) that lacked a developing nervous system.
D) that lacked an outer covering of epidermis.
E) in which the blastopore became the mouth.

Question

Quizplus · Accepted Answer

Chordin and Noggin are both secreted by the notochord and are important in the development of the nervous system. Blocking their production would likely result in an embryo that lacks a developing nervous system.

Experiments on Amphibian Embryos Have Shown That the Notochord Secretes