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:
Public Good
A good that is non-excludable and non-rivalrous, meaning it can be consumed by many people without diminishing its availability to others.
National Defense
The protection and defense of a country against foreign threats and aggression, typically through military means.
Marginal Cost
The cost of producing one additional unit of a good.
Public Good
Goods that are non-excludable and non-rivalrous, meaning they can be used by multiple people simultaneously without diminishing availability to others.
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