Question

question 4
what is the name of the \organizer\ region that induces mesoderm cells to form the notochord?
zpa
grey crescent
dorsal lip
bicoid

Explanation:

The dorsal lip of the blastopore is the organizer region in embryonic development that induces mesoderm cells to form the notochord. The ZPA (zone of polarizing activity) is related to limb - patterning, the grey crescent is an area in frog eggs with important developmental cues but not the notochord - inducing organizer, and bicoid is a gene in Drosophila important for anterior - posterior axis determination.

Answer:

C. Dorsal lip