pattern of DNA nicking and repair synthesis in male meiotic cells of lilies and rodents during the zygotene-pachytene stages of meiosis when crossing over was presumed to occur. The presence of a common pattern between organisms as phylogenetically distant as lily and mouse led the authors to conclude that the organization for meiotic crossing-over in at least higher eukaryotes is probably universal in distribution.

Human abnormalities and medical applications

Following the advent of procedures that allowed easy enumeration

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