منابع مشابه
Lampbrush chromosomes of the chicken, Gallus domesticus
We examined lampbrush chromosomes (LBC) prepared from chicken oocytes of 1-3-mm diam using both light and electron microscopy. Both macro- and microchromosomes form LBC with morphologies very similar to the well known newt and salamander LBC. In chicken LBC typical loops have a contour length of approximately 15 microns, although some loops range up to 50 microns. Multiple transcription units a...
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EVERAL workers have already reported that hybridization between Nicotiana species can bring about chromosome instability. One conspicuous case is loss of somatic plumbaginifolia chromosomes in derivatives of N . tabacum X N . plumbaginifolia hybrids (MOAV 1961). The present paper deals with another peculiarity of alien chromosomes in tobacco hybrid derivatives. It reports on heritable changes i...
متن کاملChromosomes in Hybrids between Euchlaena Perennis and Zea
Hybrids between maize (Zea mays L.) and perennial teosinte (EuMaena perennis Hitchc.) offer a favorable opportunity to follow the behavior of triplicate sets of chromosomes in a triploid hybrid. Maize, the diploid parent, has been carefully analyzed both genetically and cytologically. Perennial teosinte seems to be unquestionably a true tetraploid. Its tetraploid character is evident from (1) t...
متن کاملDNA replication in the chromosomes of the chicken, Gallus domesticus.
DNA fibre autoradiography has been used to study the replication of chromosomal DNA from chicken cells in tissue culture at 37 °C. The 5-phase is estimated to be about 75 h. Replication proceeds in the manner first described by Huberman & Riggs. Tandemly arranged units replicate bi-directionally from fork-like growing points, the times of initiation of individual replicating sections being stag...
متن کاملTRANSPLANTATION IMMUNITY, IMMUNOLOGICAL TOLERANCE, AND CHICKEN x TURKEY INTERSPECIFIC HYBRIDS.
Although a high degree of tolerance of homografts of skin and other tissues can consistently be induced in a variety of avian and mammalian species by exposure of embryonic or neonatal hosts to homologous cells,1 2 nearly all attempts to confer tolerance in respect of grafts of heterologous origin have given very disappointing results in terms of the degrees of unresponsiveness obtained. Howeve...
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ژورنال
عنوان ژورنال: Genetics Selection Evolution
سال: 1972
ISSN: 1297-9686
DOI: 10.1186/1297-9686-4-4-495