Abstract
The use of telomeric C-bands in wheat-rye hybrids has made it possible to distinguish three types of wheat-wheat (1BL) and wheat-rye associations (a, end-to-end extremely distal; b, end-to-ed distal; and c, interstitial) between homoeologous chromosomes at different metaphase I stages (early, middle and late) and also to estimate the actual recombination frequencies for such associations at anaphase I. There was a decrease of the a and b association frequencies during the different metaphase I stages, whereas the c type remained without variation in all stages. A good fit between the frequencies of c associations at metaphase I and the number of recombinant chromosomes at anaphase I, assuming a maximum of one chiasma per bond, was found; however, there was no correspondence between metaphase I and anaphase I data when all associations (a + b + c) were considered. In addition, rye-rye homologous pairing was observed at metaphase I, but no evidence for rye-rye recombination was found at anaphase I. The results indicate that most of end-to-end (a and b) homoeologous and nonhomologous associations are actually nonchiasmatic and are a remnant of prophase pairing.
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Selected References
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- Herman T. S., Jones S. E. Systematic restaging in patients with Hodgkin's disease: a Southwest Oncology Group Study. Cancer. 1978 Oct;42(4):1976–1982. doi: 10.1002/1097-0142(197810)42:4<1976::aid-cncr2820420442>3.0.co;2-n. [DOI] [PubMed] [Google Scholar]
- John B. Myths and mechanisms of meiosis. Chromosoma. 1976 Mar 10;54(4):295–325. doi: 10.1007/BF00292812. [DOI] [PubMed] [Google Scholar]