منابع مشابه
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...
متن کاملSomatic Genomic Variations in Extra-Embryonic Tissues
In the mature chorion, one of the membranes that exist during pregnancy between the developing fetus and mother, human placental cells form highly specialized tissues composed of mesenchyme and floating or anchoring villi. Using fluorescence in situ hybridization, we found that human invasive cytotrophoblasts isolated from anchoring villi or the uterine wall had gained individual chromosomes; h...
متن کاملSomatic Genome Variations in Health and Disease
It is hard to imagine that all the cells of the human organism (about 10(14)) share identical genome. Moreover, the number of mitoses (about 10(16)) required for the organism's development and maturation during ontogeny suggests that at least a proportion of them could be abnormal leading, thereby, to large-scale genomic alterations in somatic cells. Experimental data do demonstrate such genomi...
متن کاملA 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...
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ژورنال
عنوان ژورنال: The Biological Bulletin
سال: 1918
ISSN: 0006-3185,1939-8697
DOI: 10.2307/1536400