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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.
Selection Bias Selection bias is defined as a bias when the subjects, groups or data is selected for the analysis is not randomly selected and forms a non representative sample of the given population. In other words, selection bias occurs where there is no randomization while selecting a sample and thus the selected sample is not a representative sample for the population. It is also known as selection effect. Some of the examples of selection bias are given below: