Copyright information:  information content copyright owned by Cat World expires 70 years from March 1973 at which time the information minus the research notes may be placed in the public domain.
Research Note:  Here is an article which has been partially converted for online presentation.  It is from the March/April 1974  issue of Cat World which holds the copyright for the text.  This text has not been split into separate files so that it makes for easier printing.  Question:  Is it better to allow for printing or optimize for reading and information chunking.  Note the graphics additions to visually break the text.  Note the bolding of terms and the links to other information -- which add a new original dimension to the work and enhance the information offering.

Chromosome Mutation

Genetic changes can be caused by alteration in the number or structure of the chromosomes themselves and an example of this sort of mutation is the XXY individual reported in man, mouse and cat. In all three it is male but associated with sterility and other defects. In man the XXY is known as the Klinefelter condition and the feline equivalent is said to be the male tortoiseshell cat.