In a Developing Drosophila Melanogaster Embryo, a Hierarchy of Gene

Short Answer

In a developing Drosophila melanogaster embryo, a hierarchy of gene regulatory interactions subdivides the embryo to regulate progressively finer details of patterning. For each of the following proteins, indicate which expression pattern (1 to 4) in the schematic drawing below is more appropriate. Your answer would be a four-digit number composed of digits 1 to 4 only, with each digit used once, e.g. 3412.

( ) Hunchback (product of a gap gene)
( ) Engrailed (product of a segment-polarity gene)
( ) Bicoid (product of an egg-polarity gene)
( ) Even-skipped (product of a pair-rule gene)