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• W2021049287 abstract "THE ANALYSIS of end arrangements in these three herbaceous species is the culmination of that part of a study on chromosomes in Datura species which was initiated in our laboratory over 25 years ago. Preliminary cytological examination made by Bergner showed that each Daturm species has the same number of chromosomes, n 12. At meiosis they are arranged in 12 pairs and form 12 bivalents (Blakeslee, 1932; Bergner, 1939). The free ends of each in the standard line of D. stramonium are indicated by numbers 1,2,3,4.... 23,24 and the 12 chromosomes are consequently designated as 1.2, 3.4, . . . 23.24, the 1.2 being the largest, the 23.24 the smallest one (Blakeslee and Cleland, 1930). Attention is called to the fact that whenever the is represented numerically the numbers refer only to its ends. For brevity the word will be used in the text synonymously with chromosome end arrangement. The method for analysis used in the present studies is the same which has been developed by Bergner and Blakeslee in a series of investigations (Blakeslee, 1927, 1932; Bergner and Blakeslee, 1930). It is based on Belling's observation that like ends of homologous chromosomes are mutually attracted (Belling, 1921) and on his hypothesis of segmental interchanges between non-homologous chromosomes (Belling and Blakeslee, 1926). These two factors explain the presence of circles and chains formed by chromosomes at meiosis in hybrids from intra-se crosses. The presence of 12 closed bivalents in a hybrid at meiosis indicates that all chromosomes in the race tested are homologous with the chromosomes in the tester. A reduced number of bivalents in the hybrid together with an association of 4 or more chromosomes forming circles or other configurations indicates that the ends of some chromosomes in the tested race are rearranged in comparison with the tester. Such races in intra-se crosses represent new chromosomal types. They are called Prime Types (PT's) and the D. stramonium race selected as the standard type is PT]. The homologous ends and the rearranged ends of chromosomes are expressed numerically in terms of chromosomes in the standard PTI. More than one prime type was found by Bergner in each species with the exception of D. pruinosa and D. discolor. (Bergner and Blakeslee, 1941; Bergner, 1943a,b)." @default.
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• W2021049287 date "1953-10-01" @default.
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• W2021049287 title "CHROMOSOME END ARRANGEMENTS IN DATURA INOXIA, D. METELOIDES AND D. METEL" @default.
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• W2021049287 doi "https://doi.org/10.1002/j.1537-2197.1953.tb06534.x" @default.
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