09-01-2006, 05:51 AM
During normal limb development, cells of the lateral plate mesoderm induce the overlying ectoderm to form the apical ectodermal ridge (AER). If the mesoderm was unable to induce or maintain the AER due to a gene mutation or exposure to a teratogen, what would be the consequence?
a) Nothing would happen because the mesoderm does not normally induce the formation of the
AER.
b) Amelia or meromelia would result.
c) Syndactyly would result.
d) Two of the above are correct
a) Nothing would happen because the mesoderm does not normally induce the formation of the
AER.
b) Amelia or meromelia would result.
c) Syndactyly would result.
d) Two of the above are correct
[mero-1 + -melia] congenital absence of any part of a limb, as in adactyly, hemimelia, or phocomelia; cf. amelia.
have to be someplace else!