SPONTANEOUS CHROMOSOME ABERRATIONS IN TRIPLOID TRADESCANTIA HYBRIDS
نویسندگان
چکیده
منابع مشابه
Spontaneous Chromosome Aberrations in Triploid Tradescantia Hybrids.
T HAS recently been found that chromosome aberrations of the types I induced by various kinds of radiations occur spontaneously during the development of the pollen grains in diploid species and especially in species hybrids of Tradescantia (GILES 1940). The present studies have shown that the frequency of these aberrations is even higher in triploid Tradescantia hybrids. Furthermore, it has be...
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HE sterility of triploids and other unbalanced polyploids is generally conT ceded to be a consequence of irregularities in the distribution of univalents and multivalents at meiosis. Occasional viable gametes are produced, however, because of nonrandom orientation and segregation of chromosome associations. Thus, SATINA and BLAKESLEE (1937a, b) found a higher frequency of n and 2n chromosome nu...
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ROSS chromosome aberrations or rearrangements have recently G come to occupy an important position in the study of problems of evolution and speciation. Such aberrations are known to occur in many plants and animals. However, the spontaneous occurrence of these aberrations is rather difficult to study, since their frequency is usually very low. In an endeavor to obtain a further understanding o...
متن کاملThe Effect of Intensity of Infrared on X-Ray Induced Chromosome Aberrations in Tradescantia.
REVIOUS investigations have shown that infrared is effective in increasping the number of chromosomal aberrations induced by X-radiation ( KAUFMANN, HOLLAENDER and GAY 1946; SWANSON and HOLLAENDER 1946; YOST 1951). There has been little agreement at the interpretive level, however, on the mode of action of the infrared in producing this increase. Two hypotheses have been advanced. One proposes ...
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COMPARISON of microsporogenesis and microspore development A in a triploid Tradescantia has shown significant deviations from the normal diploid behavior. Occasional dicentric chromatids a t meiosis are found in diploid Tradescantias, but inversion crossovers in the triploid are much more frequent. An analysis of microspore development in a triploid Tradescantia shows that chromosome number has...
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ژورنال
عنوان ژورنال: Genetics
سال: 1941
ISSN: 1943-2631
DOI: 10.1093/genetics/26.6.632