Summary of the imaginal disc story -

Having followed the discoveries of the team working on this problem, you have (hopefully!) deduced that allowing the Co and s parameters of a morphogen gradient to increase, and controlling cell proliferation by % increase in the concentration of the morphogen, has the effect of ensuring that the tissue and its morphogen gradient grow in scale with one another.

The "French flag" (pattern of positional information based on a gradient) therefore remains as a French flag, with no extra stripes or missing parts, and nothing becoming disrproportional

drawing of French flag model


Before going on to the next section, take a moment to ask yourself the following questions:

(Considering questions such as those above is an example of 'reflective practice': the answers do not tell you any more scientific facts, but they can guide you in the process of becoming a scientist).

When you are ready to leave the world of imaginal discs, to consider a quite different type of problem, please click here.