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.

Biology & Microbiology

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