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IOMETRICAL analyses of the regulation of development have necessarily dealt with the relationships between anatomical parts. Most of these attempts have remained in the realm of allometry, the principles of whi were developed and elaborated upon by HUXLEY (1932) and others (see B O N1955; and BERRILL ~ 1955). However these studies have failed to establish a universality of the allometry equation since many exceptions to a strict adherence of data to the hypothesized straightline relationships have been noted (see RIARDS KAVANAGH and 1945; and REEVE and HUXLEY 1945). Nevertheless, allometric methods still provide a useful descriptive tool. Genetic studies of this problem have been concerned largely with comparisons of body proportions of animals differing in one or more major genes, the number of genes being either known or hypothesized (see PECK SIN and 1950). An altogether different approa to the problem of regulation of development was made by WRIGHT (1932, 1954) who relegated the relationships of sizes of parts in the rabbit and the fowl to a hierarical grouping of general and special factors. In the same study he roughly estimated the relative contributions of genetic and environmental factors. BURT(1943) has also used the methods of factor http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Genetics Genetics Society of America

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