Genes in nonexperimental herds have been identified by several procedures. Some procedures, like the search for ancestors common to both parents in the case of recessive inheritance, afford presumptive evidence. Others, like segregation analysis, are more rigorous and require fewer restrictive assumptions. The usual analytical approach is to examine sequentially familial data for conformance with various hypothesis, from simplest to more complex when the simpler is untenable. Often the simplest later proves to have been tenable only because the data were scanty, particularly when a trait is rare or difficult or costly to measure or observe.

K. Huston, R. Chase, R. Waller

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 1, Madrid, Spain, 39–46, 1974
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