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UANTITATIVE geneticists have long been aware that correlated responses Q are common in populations under different types of selection. The primary implication of a correlated response is that the character under selection is genetically correlated with another character, though other parameters affect the magnitude of the correlated response. In the course of selection for a single trait, other than a trait pertaining to reproduction, for an extended period of time, one expects sooner or later to encounter a decline in fertility or net reproduction, This has been reported by

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Realized heritability was 0.126 -+ 0.029. The