Genetics, Vol 135, 297-308, Copyright © 1993


INVESTIGATIONS

Mixed Segregation and Recombination of Chromosomes and YACs During Single-Division Meiosis in spo13 Strains of Saccharomyces cerevisiae

Y. Hugerat and G. Simchen
Department of Genetics, The Hebrew University of Jerusalem, Jerusalem 91904, Israel

Diploid yeast strains, homozygous for the mutation spo13, undergo a single-division meiosis and form dyads (two spores held together in one ascus). Dyad analysis of spo13/spo13 strains with centromere-linked markers on five different chromosomes and on a pair of human DNA YACs shows that: (a) in spo13 meiosis, chromosomes undergo mixed segregation, namely some chromosomes segregate reductionally whereas others, in the same cell, segregate equationally; (b) different chromosomes exhibit different segregation tendencies; (c) recombination between homologous chromosomes might not determine that a bivalent undergoes reductional rather than equational segregation.


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