Which of the following regarding the Spemann organizer is true? (Check all that apply.)
_____ Signaling molecules from the organizer inhibit ventral development.
_____ The dorsal lip cells directly activate dorsal development.
_____ The organizer determines the dorsal-ventral axis.
_____ The organizer forms in the area of the grey crescent.
_____ The point of sperm entry determines the orientation of the organizer.
__X__ Signaling molecules from the organizer inhibit ventral development.
_____ The dorsal lip cells directly activate dorsal development.
__X__ The organizer determines the dorsal-ventral axis.
__X__ The organizer forms in the area of the grey crescent.
__X__ The point of sperm entry determines the orientation of the organizer.
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