title: [Population genetics study of the differential fertility in urban populations].
abstract: In an urban population with widespread birth control practice the distribution of the number of pregnancies, births and abortions was studied in a cohort of women of completed fertility. The mean number of pregnancies per woman was 4.03 +/- 0.08 (sigma = = 2.98); the mean number of births - 1.12 +/- 0.02 (sigma = 0.77). 7.4% of women which had completed their reproductive performance had no pregnancies and 19.5% - no births. The Crow's Index of the Opportunity for Selection and its components connected with differential fertility and differential mortality were estimated. In the population under study two components of selection - selection at the prenatal stages and selection associated with infertility - are shown to be still significant. Such type of selection is exemplified by investigation of couples suffering from repeated spontaneous abortions.
mesh_terms: D000026:Abortion, Habitual / Q000235:genetics*; D005260:Female; D005298:Fertility; D005828:Genetics, Population; D006801:Humans; D008875:Middle Aged; D009031:Moscow; D011247:Pregnancy; D012641:Selection, Genetic; D014505:Urban Population
vernacular_title: Populiatsionno-geneticheskoe issledovanie differentsial'noĭ plodovitosti v gorodskom naselenii.