A new dwarf isolate in the chicken: a possible new allele at the dw locus.

A dwarf isolate has been found in the chicken which is due to an allele other than dw at the dw locus. The distribution of offspring from males heterozygous for dwB and the allele responsible for the dwarf isolate was inconclusive with respect to whether they were the same allele or not. However, the results of this mating in conjunction with the appearance of the pure line dwarf isolate birds led the authors to tentatively conclude that the dwarf isolate was not due to dwB but rather to a new allele at the dw locus designated dwM.