title: The identification of a repeated DNA sequence involved in the karyotype polymorphism of the human Y chromosome.
abstract: We show that individual men are polymorphic for the amount of two different repeated DNA sequences. The amount of one of these sequences is proportional to the length of the brightly fluorescent heterochromatin on the Y chromosome. There are no detectable alterations in sequence between polymorphic individuals. Female DNA contains sequences complementary to those found on the Y, but at a much reduced level.
mesh_terms: D001483:Base Sequence; D005075:Biological Evolution; D004247:DNA / Q000032:analysis*; D005260:Female; D006801:Humans; D008297:Male; D011110:Polymorphism, Genetic; D012730:Sex Chromosomes / Q000032:analysis*; D013045:Species Specificity; D014998:Y Chromosome / Q000032:analysis*
chemical_list: D004247:DNA