Developmental Mechanisms Problem Set

Problem 4: Role of the optic vesicle in embryonic lens development

The formation of the lens from the ectoderm layer during frog embryonic development is dependent upon signals received from the underlying optic vesicle This is an example of:

A. embryonic induction
The optic vesicle induces the ectoderm layer above it to become placode tissue. The placode tissue then induces the formation of the optic cup, which in turn induces the placode tissue to form the cornea and lens of the eye.

B. pattern formation

C. homeotic gene regulation

D. polarity in the embryo

E. apical dominance

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