If the Apical Ectodermal Ridge Is Surgically Removed from an Embryo

question 61

Multiple Choice

If the apical ectodermal ridge is surgically removed from an embryo, it will lose

• A) positional information for limb-bud pattern formation.
• B) guidance signals needed for correct gastrulation.
• C) unequal cytokinesis of blastomeres.
• D) the developmental substrate for the gonads.
• E) the developmental substrate for the kidneys.

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Definitions:

Vertebral Column

A series of vertebrae extending from the skull to the lower back, providing the main support for the upper body and encasing the spinal cord.

Trochlea

Structure shaped like or serving as a pulley or spool.

Humerus

The extended arm bone stretching from the shoulder down to the elbow.

Ulna

A long bone in the forearm, located on the side opposite the thumb.