What do gap genes, pair-rule genes, segment polarity genes, and ...

[aero]

What do gap genes, pair-rule genes, segment polarity genes, and homeotic genes all have in common?
A) Their products act as transcription factors.
B) They have no counterparts in animals other than Drosophila.
C) Their products are all synthesized prior to fertilization.
D) They act independently of other positional information.
E) They apparently can be activated and inactivated at any time of the fly's life.

[Hawke]

I'd go with A. It makes sense.

[aero]

Thanks!