Search for: [Description = "On the basis of 3\-year studies transferrin polymorphism in Apodemus agrarius in chosen differently isolated urban \(Warsaw\), suburban and field \(Turew\) populations it was stated as follows\: \(a\) a lack of differences in variability of transferrin related to sex, sexual activity and season \(summer\-early autumn\), \(b\) differences in frequencies of transferrin alleles between populations during two years of studies when the gradient of genetic variability in populations was opposite to gradient of isolation and urbanization of habitat studied, \(c\) significantly different frequencies of transferrin alleles from year to year in isolated population from the city centre."]