Developmental Mechanisms Problem Set

Problem 6: Spemann and Mangold's embryonic induction experiment

What amphibian embryonic tissue was shown by Spemann and Mangold to induce the formation of the neural plate, and in some cases, to induce a complete second embryo.

A. equatorial mesoderm

B. dorsal lip of the blastopore
Spemann and Mangold found that the dorsal lip of the blastopore is responsible for neural induction. That is, this tissue has the ability to direct the development of host tissue to form a second neural tube.

C. yellow crescent

D. optic cup

E. zone of polarizing activity

The Biology Project Department of Biochemistry and Molecular Biophysics The University of Arizona Thursday, October 30, 1997
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