asymmetrical karyotype
Found inside – Page 131On the other hand , the increase in asymmetry cannot always be correlated with morphological advancement . ... the taxa like Cycas , Ginkgo , Pseudolarix , some species of Podocarpus and Welwitschia have highly asymmetrical karyotypes . Found inside – Page 11... a correlation between asymmetry in karyotype and evolutionary specialization of the plants in habit and morphology . ... have karyotypes which are more asymmetrical than those which are considered primitive on the basis of morphology . Found inside – Page 1100Chromosomes differ in size are called as asymmetrical karyotype. • When the karyotype of an individual is represented diagrammatically in the form of ... Found inside – Page 947... asymmetrical karyotypes , i.e. , in karyotypes of animals possessing both macrochromosomes and microchromosomes ... in the karyotype , 6-8 of which are customarily called macrochromosomes ( Ma ) ( in size they are approximately equal ... Found inside – Page 78Taxa of symmcưical karyotype are thought to be the most primitive than those with asymmetrical karyotype ( Stebbins , 1958 ) ; Singh and Moss , 1982 ) . On the basis of this criterion Akahsi may be considered as the primitive follewed by Paba ... Found inside – Page 30Meiosis was not normal due to association of chromosomes at diakinesis and metaphase I leading to irregular separation at anaphase. Root tip cells showed 2n=66 chromosomes (Fig.7). The karyotype was asymmetrical (3C), and consisted ... Found inside – Page 44... of the species studied here , except for V. geminata , which had a more asymmetrical karyotype ( A , = 0.25 and A2 = 0.21 ) . ... The difference among the karyotypes of the three populations of V. polyanthes analyzed here ( Table 2 ) deserves ... Found inside – Page 378Degrees of asymmetry in karyotype among the fishes are broadly taxon specific. As noted above, the Cyprinidae predominantly have highly asymmetrical ... Found inside – Page 304( d ) Cicer arietinum 2n = 16 , comparatively asymmetrical karyotype . Chromosome no . 1 is satellited . Length of the chromosomes varies from 3 . 4 ' — 1 . 6 . . Total haploid chromatin length = 19 . 1 um . ( e ) Cajanus cajan 2n = 22 ... Found inside – Page 8(1975) investigated the karyotypes of eight cultivars of Areca catechu and four ... Obviously, the lesser chromatin matter and an asymmetrical karyotype in ... Found inside – Page 252In one in the karyotype of A. longicornu , in which metacentric chromo ... In the case of Asymmetrical karyotypes characterize A. papilionacea and A. corio ... Found inside – Page 1113 Karyotype The chromosome complement of Ginkgo biloba is a bimodal and asymmetrical karyotype [8, 10–15, 17, 22, 23]. The karyotypes or idiograms presented ... Found inside – Page 149Asymmetrical karyotypes possess many chromosomes with subterminal centromeres , or great differences in size between the largest and the smallest ... Found inside – Page 38... and in having a mixture of acrocentric, metacentric and telocentric chromosomes (a condition that Morescalchi, 1975, calls an asymmetrical karyotype). Found inside – Page 160Again in asymmetrical karyotype , all chromosomes may either be of two distinct size groups ( e.g. Yucca arakansana ) or there is a gradation in size ( e.g. ... Found inside – Page 6On the contrary,asymmetrical karyotypes “possess many chromosomes with subterminal centromeres, or great differences in size between the largest and the ... Found inside – Page 186Again in asymmetrical karyotype , all chromosomes may either be two distinct size groups ( e.g. Yucca arakansana ) or there is a gradation in size ( e.g. ... Found inside – Page 46DISCUSSION The basic chromosome number, karyotype asymmetry and polyploidy are the principal ways in which karyotypes differ from species to species in the genus Chlorophytum (table 1). 1. Basic chromosome number Chromosome ... Found inside – Page 42This involves either 1 ) chiasma localization ( Southern , 1970 ) or , 2 ) an asymmetrical distribution of chiasmata among bivalents ( Cameron and Rees , 1967 ) which can be concurrent with an unequal distribution of chiasmata among cells ... Found inside – Page 376A karyotype consisting of chromosomes all essentially similar to each other in size and with median or submedian centromeres may be termed a symmetrical one. Asymmetrical karyotypes possess 376 D. F. CAMERON. Species C.P.I. No. Found inside – Page 28... taxa of Chara globularis complex . 9 . No correlation between polyploidy and sexuality seems to exist in Charophytes . 10. Most of the Charophytes possess asymmetrical karyotypes irrespective of their morphological level of advancement . Found inside – Page 481 Further , from Table L it is clear that the degree of asymmetry of the karyotypes of these four species is of the same order . ... These observations lead to the conclusion that little karyotypic changes have taken place in the karyotype of these ... Found insideRatnambal then categorized them based on Stebbin's classification of symmetry-asymmetry of karyotypes (Stebbins 1958). An asymmetrical karyotype of 1B was ... Species relationships were investigated in a western North American polyploid complex in the genus Aster (Asteraceae). Found inside – Page 106When the karyotype of an individual is represented diagrammatically in the form of ... ( homogeneous ) karyotypes are regarded as primitive and asymmetrical ... Found inside – Page 219Each family contained only three different karyotypes : again the triple homozygote , the AB ' C / AB " cc single heterozygote , and ... Finally , of four sons in family 67 - 32 , three showed an A / aa trivalent plus an asymmetrical B / bb trivalent ( v . Found inside – Page 21Key words : Ginkgo biloba germplasm ; karyotype evolution ; asymmetrical karyotype coefficient ; genetic distance 银杏( Ginkgo biloba )是第四纪冰川之后唯一在中国保存下来的子遗物种,美国的 Wilson 认为,该种于六世纪从中国传到日本( Li ... Found insideFrom the above cited observations, it could be noticed that L. mucronata shows asymmetrical karyotype. Such asymmetry is mainly due to the presence of chromosomes having subterminal and terminal centromeres and also due to the ... Found inside – Page 284The way highly asymmetrical karyotypes have originated, both in relation to chromosome arm and chromosome size with very long and very short chromosomes, ... Found inside – Page 81Symmetrical and asymmetrical karyotypes. A karyotype may be symmetrical or asymmetrical. A perfectly symmetrical karyotype has all metacentric chromosomes ... Found inside – Page 51Considering this assumption, an asymmetrical karyotype in species with 2n=26 chromosomes should be expected, with two small chromosomes of the t, st, ... Found inside – Page 975Karyotype lengths of Claytonia virginica diploid cytotypes 10 um Flavonoid race Chromosome no . ... taxa members of the section . clearly primitive by other criteria possess Karyotypic data support the hypothesis that asymmetrical karyotypes . Found inside – Page 280An asymmetrical karyotype of “1B” was found in all the cultivars except cultivars of Bangkok and Jorhat, which have a karyotype asymmetry of 1A (Ratnambal ... Found inside – Page 293For planning hybridization and other possessed a more asymmetrical karyotype . Variations observed breeding programs there is need to have some idea about the in the karyotypic formulae ( Table 1 ) of the cultivars indicate genomic ... Found inside – Page 21So , among the 3 species , the karyotype of Z. candida is more asymmetrical and shows the advanced nature of the species and 2. grandiflora shows primitive nature . From the above mentioned reasons about variations in chromosome ... Found inside – Page 89Symmetrical Karyotype; 2. Asymmetrical Karyotype. A symmetrical karyotype has all metacentric chromosome of the same length. In case of asymmetrical ... Found inside – Page 97The karyotypes were mostly symmetrical in tribes Cypripedieae , Orchideae and Epidendreae . But in Neottieae , while mostly the members have asymmetrical karyotypes , Goodyera repens , Spiranthes lancea have symmetrical karyotypes . Found inside – Page 41An asymmetrical karyotype of “1B” was found in all cultivars except in cvs. Bangkok and Jorhat, which have a karyotype asymmetry of 1A (Ratnambal, 1979). Found inside – Page 375The karyotype formula given by Rucova ( 1966 ) is extremely similar to mine , both being 2n = 2x = 14 = 2m + 6sm + 6st ... For example , annuals such as V . villosa , V . sativa and V . faba ( 2B , 38 ) have more asymmetrical karyotypes than ... Found inside – Page 183Species with symmetrical karyotypes , having large chromosomes with median centromere , are primitive while those with asymmetrical karyotypes having smaller chromosomes with subterminal centromere are regarded as advanced [ 16 ] . Found inside – Page 155... lower the value greater will be the differentiation between the species , for the varia asymmetry in the karyotype . ... in considered that symmetrical karyotypes are primiPennisetums took place through alterations in tive and asymmetrical ... Found inside – Page 49Thus, a symmetrical karyotype will have chromosomes of more or less similar size, with the chromosome arms of almost equal length. An asymmetrical karyotype ... Found inside – Page 195(1975) investigated the karyotypes of eight cultivars of A. catechu and four ... Obviously, the lesser chromatin matter and an asymmetrical karyotype in A. Found inside – Page 250... related series tend to nave greater asymmetry of karyotype than the more primitive species . ... 5a ) , a detailed comparative study would be necessary to trace the trends of ohromosomal evolution toward more asymmetrical karyotypes . Found inside – Page 148Eucharis aff . bakeriana exhibits the most asymmetrical karyotype with 4 pairs of sub - telocentric chromosomes and average arm ratio of 2 . 16 ( Figure 2 and Table 2 ) . Preliminary studies of other taxa of subg . Eucharis ( Meerow , unpubl . ) ... Found inside – Page 47A. elegans had an asymmetrical karyotype with meta- and submetacentric chromosomes: its meioformula was n=20+XY. In spermatogenesis, chiasmatic meiosis with ... Found inside – Page 169Although no definitive tendency for the genus can be taken from the correlation between karyotype size and asymmetry, it is suggested that the more asymmetrical karyotypes have greater lengths of haploid sets (Table 2), indicating a ... 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