A Karyotypical Study on Fritillaria L.from Anhui Province Cloning of the Telomere Associated Sequences of Rye B-chromosomes Preliminary study on B-chromosomes of Lilium davidii var.unicolor A Preliminary Observation on B-Chromosomes of Regal lily THE CHROMOSOME OBSERVATION ON 4 SPECIES IN THE GENUS RHUS Study on Genetic Behaviour of B Chromosomes at Meiosis in Agropyron Gaertn A Preliminary Study of B-chromosome and Physiological Resistance Characteristics of Allium mairei THE KARYOTYPE ANALYSIS OF RYE (SECALE CEREALE) Karyotypes of the Genus Fritillaria from South Anhui A UNFATHOMABLE ENIGMA OF CHROMOSOME GENETICS: B-CHROMOSOME