SOMATIC CHROMOSOMES IN TRADESCANTIA

Segmental Interchange in Chromosomes of Tradescantia.

Chromosome ring formation has been found in a number of difierent genera. In certain species of Oenothera and of Hypericum and in the monotypic genus Rhoeo, all the chromosomes may be united in a single ring or chain a t meiosis. Ring formation is maintained in these plants by a system of balanced lethals. In Datura, Zea, Pisum and Campanula rings of four or more chromosomes have been described...

Somatic Chromosomes of Long-Eared Desert Hedgehog Hemiechinus auritus

Affinity Distance Values among Somatic Metaphase Chromosomes

In maize root-tip metaphase preparations, all distances between two chromosomes were measured in 50 cells from each of seven stocks and in 30 from one stock; four were arrested with cold, two with 8-hydroxyquinoline, one with colchicine and one with monobromonaphthalene Standardized, affinity-distance values were calculated for all pairs of homologues and pairs of nonhomologues from each prepar...

A study of somatic chromosomes in a Japanese population.

THE CHROMOSOMES OF HUMAN BEINGS, in various tissues, have been investigated with a variety of methods by many authors since the end of the last century. Early investigators found that the approximate chromosome number for man was from 16 to 32 until the appearance of de Winiwarter's historic paper in 1912 reporting 47 chromosomes in human males (cf. Makino, 1956). Later, Painter (1923) reported...

The Effects of Ultraviolet and X-Ray Treatment on the Pollen Tube Chromosomes of Tradescantia.

HE cytogenetic interest in ultraviolet radiation resides in the hope T that the qualitatively discriminating nature of this type of radiant energy will yield still further evidence as to the structure and behavior of the hereditary mechanism. It is now known that ultraviolet, like X-rays, can produce gene mutations and chromosomal changes; it is likewise known that, unlike X-rays, ultraviolet i...