J. B. Davey
Articles written in Journal of Genetics
Volume 52 Issue 2 May 1954 pp 425-440
‘Wall eye’—partial or total discoloration of the iris—is known to occur frequently but not constantly in dappled dachshunds, merled collies, and other merled breeds of dog. Observations are recorded on the dappled dachshund, the merled collie, and the merled miniature collie, showing that in contrast to the inconstant iris anomaly the tapetum of such animals is always anomalous. It is generally totally lacking and when present it is rudimentary. The anomalies of the tapetum are easily observed with the ophthalmoscope.
It is known that the dappled or merled animal is heterozygous, and it has been suggested that there is a gene
Attention is drawn to somewhat similar occurrences in the great Dane, and to the possibility that a gene of this type is widely distributed over different species. The relationship of the appearances seen in the dog to the syndrome described by Waardenburg in man is discussed.
We are indebted to Miss M. Hill of West Haddon, Mrs V. Ripley of Weekley, Miss K. M. Raine of Dartford, Miss W. Riley of Torquay, and Miss M. E. Osborne of Harrietsham for their co-operation and help.
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