Biology · Developmental Biology
The hedgehog pathway is extremely important in vertebrate limb development, neural differentiation, and facial morphogenesis. In accordance with this, what would happen in mice that are homozygous for a mutant null allele of sonic hedgehog (shh)?
- 1Limbs would form normally but the mice would have severe facial abnormalities.
- 2The midline of the face would be reduced and a single eye would form in the center of the forehead (cyclopia).✓
- 3Eyes would form normally but digits would be completely malformed.
- 4Mutations of shh would activate tumor formation if Patched protein can inhibit the Smoothened protein.
Correct answer
The midline of the face would be reduced and a single eye would form in the center of the forehead (cyclopia).
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