IDENTIFICATION OF LINKAGE PHASE BY PARENT AL GENOTYPES

The possibility of using the phenotypic characteristics of parents for identifying the linkage phase in offspring is analyzed. It is demonst rated that parents with similar phenotypes (or marker genotypes) carry no information about the gene linkage phase in diheterozygous offspri ng. The probability of a certain linkage phase remains the same in all informative crossings. It depends on the model of inheritance of the analyzed alternative trait and is similar for di- and polyallelic mark ers. The frequencies of informative crossings and the probability of t he linkage phase for different models of inheritance of the analyzed a nd marker traits are estimated.