Genetics, Vol 144, 957-966, Copyright © 1996


INVESTIGATIONS

Regional Bivalent-Univalent Pairing Versus Trivalent Pairing of a Trisomic Chromosome in Saccharomyces cerevisiae

A. Koller, J. Heitman and M. N. Hall
Present address: Department of Biology, University of California at San Diego, 9500 Gilman Dr., La Jolla, CA 92093-0322.

In meiosis I, homologous chromosomes pair, recombine and segregate to opposite poles. These events and subsequent meiosis II ensure that each of the four meiotic products has one complete set of chromosomes. In this study, the meiotic pairing and segregation of a trisomic chromosome in a diploid (2n + 1) yeast strain was examined. We find that trivalent pairing and segregation is the favored arrangement. However, insertions near the centromere in one of the trisomic chromosomes leads to preferential pairing and segregation of the ``like'' centromeres of the remaining two chromosomes, suggesting that bivalent-univalent pairing and segregation is favored for this region.


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C. E. Guerra and D. B. Kaback
The Role of Centromere Alignment in Meiosis I Segregation of Homologous Chromosomes in Saccharomyces cerevisiae
Genetics, December 1, 1999; 153(4): 1547 - 1560.
[Abstract] [Full Text]