Abstract
THE two forms of white plumage in chickens, dominant (I) and recessive (c) white, are (with some qualifications in the case of I) epistatic to most other colours and patterns. The phenotypic uniformity of a white breed or strain may thus conceal a considerable amount of genetic diversity at loci affecting plumage colour and pattern. The mere examination of the F1 of a cross with a suitable coloured breed will suffice to determine the constitution at some loci. Data have been collected in this way on the constitution of inbred lines of two breeds: White Leghorn (W.L.) and White Plymouth Rock (W.P.R.).Attention is directed mainly to whether segregation is occurring within a particular line, or whether it is uniform (isozygous). The frequency with which segregation is found may be compared with calculations based on the coefficients of inbreeding of the lines; calculations which assume that all genotypes have an …
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