A gene may get duplicated. This may be followed by mutation in one of the copies. Functionally if this "mutated" version is very different from its counterpart then one will call it a new gene rather than simply an allele of the "original" gene. Thus a species gets a new gene. But it may also simply acquire a gene "horizontally". The rates of both these phenomenon taking place would be expected to be determined by the species under consideration. Still one may ask, generally how do they compare in their contribution to creation of new genes?
Furthermore, once a gene has been acquired by a species its maintenance would be contingent upon its contribution to the species fitness. It would be conserved if it is useful else lost if redundant (or found to be deleterious). What are the rates of this "gene dumping" phenomenon? Wondering if these "rates" could be quantitated. Then it would be interesting to compare the rate of acquiring a gene and the rate of losing a gene. Dont remember why I thought of these questions but still it would be fun to know their answers if possible.
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