Meiotic Chromosome Pairing in Interspecific Hybrids ofNicotiana
نویسندگان
چکیده
منابع مشابه
Meiotic behavior of interspecific hybrids
The meiotic behavior of four interspecific promising hybrids was evaluated by conventional cytological methods. The female genitors were two artificially tetraploidized sexual accessions of B. ruziziensis (R41 and R44, 2n = 4 χ = 36), which were crossed to an agronomically superior natural tetraploid apomictic genotype of B. brizantha (B140 BRA003395). Three of them (HBGC313, HBGC 315, and HBGC...
متن کاملChromosome pairing affinities in interspecific hybrids reflect phylogenetic distances among lady's slipper orchids (Paphiopedilum)
BACKGROUND AND AIMS Lady's slipper orchids (Paphiopedilum) are of high value in floriculture, and interspecific hybridization has long been used for breeding improved cultivars; however, information regarding the genome affinities of species and chromosome pairing behaviour of the hybrids remains almost unknown. The present work analyses the meiotic behaviour of interspecific hybrids by genomic...
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Male hybrids between three pairs of Drosophila species show no substantial distortion of Mendelian segregation and no appreciable male recombination. These results do not support the theories that meiotic drive alleles of large effect are often fixed within species and that transposable genetic elements cause speciation.
متن کاملMeiotic chromosome pairing in triploid and tetraploid Saccharomyces cerevisiae.
Meiotic chromosome pairing in isogenic triploid and tetraploid strains of yeast and the consequences of polyploidy on meiotic chromosome segregation are studied. Synaptonemal complex formation at pachytene was found to be different in the triploid and in the tetraploid. In the triploid, triple-synapsis, that is, the connection of three homologues at a given site, is common. It can even extend a...
متن کاملA role for centromere pairing in meiotic chromosome segregation.
In meiosis I, exchanges provide a connection between homologous chromosome pairs that facilitates their proper attachment to the meiotic spindle. In many eukaryotes, homologous chromosomes that fail to become linked by exchanges exhibit elevated levels of meiotic errors, but they do not segregate randomly, demonstrating that mechanisms beyond exchange can promote proper meiosis I segregation. T...
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ژورنال
عنوان ژورنال: New Zealand Journal of Botany
سال: 1975
ISSN: 0028-825X,1175-8643
DOI: 10.1080/0028825x.1975.10430348