Research CommentariesMEIOSIS

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Science  06 Feb 1998:
Vol. 279, Issue 5352, pp. 823-824
DOI: 10.1126/science.279.5352.823

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Sperm and eggs contain only half the usual number of chromosomes, so that after these two germ cells fuse at conception the new organism starts life with the correct genetic double dose. In this issue, McKim et al. report that in fruit flies the order of events during the generation of these haploid germ cells (meiosis) is quite different from what had been expected based on studies of meiosis in the yeast Saccharomyces. In his research commentary, Haber explains what we know about meiotic recombination and how to view the varying accounts of its mechanisms as revealed by studies of yeasts and flies.