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Example of Runaway Selection. Theory of random sexual selection of mates. Used to explain passing on of useless or 'expensive' genes which may create liabilities. It's called 'runaway' selection because the gene traits carried on may become liabilities if carried to extremes. The genes may in fact exaggerate physical characteristics which makes the animal less able to survive, rather than more so, in normal evolutionary theory.
A forward selection system would detect any mutation that inactivates the particular gene. There must be a selection for loss-of-function of this gene. Forward mutation selections can therefore detect a wide variety of mutations including missense, nonsense, frameshift, deletion and insertion mutations. Forward mutation rates, for this reason, are much higher than reverse mutation rates described below.