If the Apical Ectodermal Ridge is Surgically Removed from an Embryo,it

Question

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.

Accepted Answer

The apical ectodermal ridge (AER) provides positional information for limb-bud pattern formation. It is responsible for maintaining the outgrowth and patterning of limb buds during embryonic development. Without the AER, the limb buds would not develop correctly and may not form at all. Removal of the AER would result in limb defects or loss of limb formation.