The field of molecular
#genetics has generated substantial information about how genetic diseases are inherited. Discovery of the causative gene for a particular #disease can allow a DNA test to be developed to identify carriers of that gene. Selective breeding can then be used to reduce the frequency of that disease in the general population. This article reviews basic genetic principles and discusses how DNA tests are developed. Information about #DNA tests currently available to detect inherited disease in several #canine #breeds is also provided.