The rapid and great advance in molecular biologic and genetic techniques had led to investigate many physiological conditions in living organisms. One of the results of this situation is the enhanced development and application of prenatal diagnosis techniques. In fact the physiologists are generally concerned with the systems and geneticians with the components of the genes and the genetic code that indicates the phenotype. On the other hand , one of the main mechanisims in genetics is ' gene conversion' which is defined as a physiological interaction between to alleles of a gene. Also, the methods for the molecular analysis of DNA have been introduced into physiology at such an increasing scale in the last two decades that the gulf between physiology and genetics is now being bridged. One of the main fields in this area is prenatal diagnosis including cell culture and chromosome analysis in order to define any physiological disorder in human beings and also in animals.

In the present study the results of the patients who had underwent prenatal diagnosis were evaluated and discussed from this point of view.