title: Estimation of linkage disequilibrium from conditional haplotype data: application to beta-globin gene cluster in American blacks.
abstract: Simple estimators of gene frequencies and linkage disequilibria are proposed when haplotype data are available from four parental chromosomes of a child (or fetus) for whom genetic counseling is sought for a disease condition. The method is illustrated with restriction site polymorphisms associated with sickle-cell anemia (Hb-beta S) gene as surveyed in genetic counseling data from American blacks. The method suggested here is shown to be useful in testing for the significance of interactions of site-specific variations of any order in the chromosomal region assayed.
mesh_terms: D000755:Anemia, Sickle Cell / Q000453:epidemiology / Q000235:genetics*; D044383:Black People; D005787:Gene Frequency; D008040:Genetic Linkage; D005914:Globins / Q000235:genetics*; D006801:Humans; D011110:Polymorphism, Genetic; D012150:Polymorphism, Restriction Fragment Length; D014481:United States; D001741:Black or African American
chemical_list: D005914:Globins