“…McKusick, Bauer, Koop & Soctt (1964) described two Amish families in which duplication of the vagina, associated with a transverse septum and imperforate anus, appeared to be recessively inherited. Imperforate vagina was found, at frequencies of 6-6% and 3-7% in two inbred strains of mice, Aka (Chase, 1954) and 'silver' (Marx, 1936;Gowen & Heidenthal, 1942), and in almost a third of females heterozygous for the Looptail mutation (Lp: Strong & Hollander, 1949;Grüneberg, 1952).…”