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Unformatted text preview: distributed as a gradient from anterior to posterior across the embryo. The bicoid protein affects the distribution of the RNA of another gene, hunchback . This RNA ( hunchback ) is not distributed as a gradient but in a discrete way: present in the anterior, absent in the posterior. Thus there appears to be positional information in the concentration of bicoid which is read by hunchback as a threshold . One could imagine that a mutation that affected the localization of one morphogen could alter the localization of important thresholds of different morphogens, which would in turn lead to the development of new morphologies....
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- Fall '10