Abstract
Abstract SELECTION experiments for the improvement of certain traits have frequently resulted in the occurrence of a correlated response in an unselected trait (Mather and Harrison, 1949; Lerner, 1946, 1950; Falconer, 1954). Falconer (1954) discussed three main types of correlated responses. If two characters are uncorrelated genetically, then a correlated response would not be expected. A secondary character may nevertheless show an undirected departure from the original population following selection for the primary character. This type of correlated response was reported by Mather and Harrison (1949). If the two characters are correlated genetically, the secondary character will show a direct change following selection for the primary character. This is the commonly observed type of correlated response. Another type of correlated response exists if the secondary character forms an important component of the total fitness. Under these conditions the secondary character may be expected to decline, in response to selection, in either…
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