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. 1993 Feb;133(2):149–158. doi: 10.1093/genetics/133.2.149

Meiotic Nondisjunction and Recombination of Chromosome III and Homologous Fragments in Saccharomyces Cerevisiae

M Goldway 1, T Arbel 1, G Simchen 1
PMCID: PMC1205306  PMID: 8436265

Abstract

A yeast strain, in which nondisjunction of chromosome III at the first-meiotic division could be assayed, was constructed. Using chromosome fragmentation plasmids, chromosomal fragments (CFs) were derived in isogenic strains from six sites along chromosome III and one site on chromosome VII. Whereas the presence of the CFs derived from chromosome III increased considerably the meiosis I nondisjunction of that chromosome, the CF derived from chromosome VII had no effect on chromosome III segregation. The effects of the chromosome III-derived fragments were not linearly related to fragment length. Two regions, one of 12 kb in size located at the left end of the chromosome, and the other of 5 kb, located at the center of the right arm, were found to have profound effects on chromosome III nondisjunction. Most disomics arising from meioses in strains containing chromosome III CFs did not contain the CF; thus it appears that the two chromosome III homologs had segregated away from the CF. Among the disomics, recombination between the homologous chromosomes III was lower than expected from the genetic distance, while recombination between one of the chromosomes III and the fragment was frequent. We suggest that there are sites along the chromosome that are more involved than others in the pairing of homologous chromosomes and that the pairing between fragment and homologs involves recombination among these latter elements.

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Selected References

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