Once per life cycle, mitotic nuclear divisions are replaced by
meiosis I and II reducing chromosome number from the diploid level
to a haploid genome and recombining chromosome arms by
crossing-over. In animals, all this happens during formation of
eggs and sperm in yeasts before spore formation. The mechanisms of
reciprocal exchange at crossover/chiasma sites are central to
mainstream meiosis. To initiate the meiotic exchange of DNA,
surgical cuts are made as a form of calculated damage that
subsequently is repaired by homologous recombination. These key
events are accompanied by ancillary provisions at the level of
chromatin organization, sister chromatid cohesion and differential
centromere connectivity. Great progress has been made in recent
years in our understanding of these mechanisms. Questions still
open primarily concern the placement of and mutual coordination
between neighboring crossover events. Of overlapping significance,
this book features two comprehensive treatises of enzymes involved
in meiotic recombination, as well as the historical
conceptualization of meiotic phenomena from genetical experiments.
More specifically, these mechanisms are addressed in yeasts as
unicellular model eukaryotes. Furthermore, evolutionary subjects
related to meiosis are treated."
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