Double reduction and numerical non-disjunction in tetraploid maize
نویسندگان
چکیده
منابع مشابه
The Double-Reduction Landscape in Tetraploid Potato as Revealed by a High-Density Linkage Map.
The creation of genetic linkage maps in polyploid species has been a long-standing problem for which various approaches have been proposed. In the case of autopolyploids, a commonly used simplification is that random bivalents form during meiosis. This leads to relatively straightforward estimation of recombination frequencies using maximum likelihood, from which a genetic map can be derived. H...
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15 صفحه اولThe Reduction Division in Haploid, Diploid, Triploid and Tetraploid Daturas.
9These PROCUODINGS, 4, 1918 (364-370). 10 Compare the argument from here on with that on pages 337-339 of my paper, "Concerning simple continuous curves," loc. cit. 1 Mazurkiewicz, S., loc. cit., p. 123. 12 Cf. Hahn, H., Wien. Ber., 123, 1914 (2433). 13 Janiszewski, S., "Sur les continius irreductibles entre deux points," J. I'Ecole Polytech. 16, 1911-1912 (79-170). 14 Mazurkiewicz, S., loc. ci...
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A sample of 100 trisomy 18 conceptuses analysed separately and together with a published sample of 61 conceptuses confirms that an error in maternal meiosis II (MII) is the most frequent cause of non-disjunction for chromosome 18. This is unlike all other human trisomies that have been studied, which show a higher frequency in maternal meiosis I (MI). Maternal MI trisomy 18 shows a low frequenc...
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We performed a molecular study with 21 microsatellites on a sample of 82 trisomy 13 conceptuses, the largest number of cases studied to date. The parental origin was determined in every case and in 89% the extra chromosome 13 was of maternal origin with an almost equal number of maternal MI and MII errors. The latter finding is unique among human autosomal trisomies, where maternal MI (trisomie...
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ژورنال
عنوان ژورنال: Heredity
سال: 1956
ISSN: 0018-067X,1365-2540
DOI: 10.1038/hdy.1956.18