Gene duplication can occur for both protein-coding and regulatory regions of genes. In the figure below, imagine that the yellow gene and both enhancer regions in B are duplicated. Propose a mechanism for how subfunctionalization might occur. 
Definitions:
Cross Elasticity
A measure of the responsiveness of the demand for one good to a change in the price of another good.
Soft Drinks
Carbonated, non-alcoholic beverage options often flavored with various sweeteners, fruits, or other flavorings.
Substitutes
Products or services that can be used in place of each other, where the increase in price of one leads to an increase in demand for the other.
Cross Elasticity Coefficient
A measure of how the quantity demanded of one good changes in response to a price change in another good.
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