Abstract
Individual mating pairs were isolated from highly fertile matings of Escherichia coli, Hfr X F-. All the recombinants were found in the progeny of the F- exconjugant, designated as female. The segregation of markers in the cell lineage indicated: the loss of certain chromosome segments, before or after fertilization or both; coincidence of crossing over, suggestive of sporadic pairing; a possible correlation of reciprocal crossovers; recycling of meiosis; and, a process of nuclear assortment from a temporary heterokaryon.

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