1- Establish the dorso-ventral body axes in drosophila
dorsal
bicoid
dpp
egg polarity genes

2- Concentration is highest in the dorsal area and lowest in the ventral area of the drosophila embryo
dorsal
bicoid
dpp
twist

3- Switches on expression of transcription factors that lead to mesoderm induction
dorsal
bicoid
dpp
twist

4- Main signals that allow development of anterior-posterior structures
dorsal and bicoid
dorsal and ddp
bicoid and dpp
ddp and twist

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Answers:

1- Establish the dorso-ventral body axes in drosophila
Answer: dorsal

2- Concentration is highest in the dorsal area and lowest in the ventral area of the drosophila embryo
Answer: dpp

3- Switches on expression of transcription factors that lead to mesoderm induction
Answer: dorsal

4- Main signals that allow development of anterior-posterior structures
Answer: dorsal and bicoid