单项选择题

Which of the following choices lists the CORRECT sequence of gene expression during Drosophila development?
 
1. Segmentation genes
2. Egg-polarity genes
3. Homeotic genes
A、1, 2, 3
B、 2, 3, 1
C、 2, 1, 3
D、3, 2, 1
E、3, 1, 2

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