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- W4251189973 abstract "Meiosis could be studied in only three taxa, Z. candida (2n=41) and cvs. with 2n=48 and 50. When taken in conjunction with other data, it is clear that in tetraploid taxa (2n=24) generally there is normal meiosis with 12 II but at higher polyploid and aneuploid levels, a low number of multivalents in the form of rings or chains involving 3 to 8 or even more chromosomes has been consistently found. The number of chromosomes within an interchange complex is often more than the level of polyploidy, implying thereby that most of the higher ploids are complex interchange heterozygotes. Evidently, bivalent formation in tetraploids indicates that the differentiation of the chromosomes is relatively high at that level, but at higher levels chromosomes are homoeologous and form multivalents and interchange complexes. It follows, that lower ploids are alloploids with relatively simple constitution but higher ploids are complex interchange heterozygotes. This conclusion is in line with the karyotypic analysis. Although recombination in the latter is expected to contain a number of disharmonious combinations, but because of the large amount of duplicated material, the amount of sterility is not particularly high. Due to cross pollination, the process of building up of increased level of genetic complexity continues." @default.
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- W4251189973 date "1972-01-01" @default.
- W4251189973 modified "2023-10-05" @default.
- W4251189973 title "Cytogenetics of Tropical Bulbous Ornamentals" @default.
- W4251189973 doi "https://doi.org/10.1508/cytologia.37.217" @default.
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