Biology · Developmental Biology
The major structural characteristic of avian gastrulation is the primitive streak, which becomes the blastopore lips of amniotic embryos. Migration through the primitive streak is controlled by Fgf8. What would happen if the Fgf8 protein, which repels migrating cells away from the streak, is overexpressed in the primitive streak?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Cells generate mesodermal portions of the embryo.
- 2Cells of the streak will not form the paraxial mesoderm.✓
- 3Wnt signalling will be activated and orientation of the primitive streak will change.
- 4The yolk sac will be deformed.
Correct answer
Cells of the streak will not form the paraxial mesoderm.
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