Cytological studies in Scrophularia: Presence of B-chromosomes.
نویسندگان
چکیده
منابع مشابه
Cytological dissection of the triticeae chromosomes by the gametocidal system.
Triticeae species have a large and complex genome, which has made it difficult to obtain their sequence data. Some alien chromosomes called the gametocidal (Gc) chromosomes introduced into common wheat can induce chromosomal breakage resulting in the generation of deletions and translocations. The induced deletions have been established as deletion stocks in common wheat. This Gc system is also...
متن کاملCytological studies of recombination in rhesus males.
An immunofluorescence approach was used to directly examine meiotic recombination events in 483 pachytene spermatocytes from 11 male rhesus monkeys. Specifically, we examined the nuclear localization patterns of the DNA mismatch repair protein MLH1, known from analyses of other mammalian species to be a useful marker of meiotic cross-overs. Our results indicated that rhesus pachytene spermatocy...
متن کاملInfluence of the Presence of B Chromosomes on DNA Damage in Crepis capillaris
The sensitivity of different plant species to mutagenic agents is related to the DNA content and organization of the chromatin, which have been described in ABCW and bodyguard hypotheses, respectively. Plant species that have B chromosomes are good models for the study of these hypotheses. This study presents an analysis of the correlation between the occurrence of B chromosomes and the DNA dam...
متن کاملB chromosomes in Brazilian rodents.
B chromosomes are now known in eight Brazilian rodent species: Akodon montensis, Holochilus brasiliensis, Nectomys rattus, N. squamipes, Oligoryzomys flavescens, Oryzomys angouya, Proechimys sp. 2 and Trinomys iheringi. Typically these chromosomes are heterogeneous relative to size, morphology, banding patterns, presence/absence of NORs, and presence/absence of interstitial telomeric signals af...
متن کاملCytological Studies of the Nematocysts of Hydra
Entire hydras or tentacles were fixed in OsO(4) or in KMnO(4) and thereafter washed, dehydrated, and embedded in a methacrylate mixture. Ultrathin sections were cut on an experimental model, thermal expansion type ultramicrotome or on a Porter-Blume microtome. The sections were examined in an RCA electron microscope. Type EMU-2 D. "Squash preparations" for light microscopy, were made from the h...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: CYTOLOGIA
سال: 1979
ISSN: 0011-4545,1348-7019
DOI: 10.1508/cytologia.44.211