This article constitutes part of McClintock's larger body of work on ring chromosomes in which she found that the chromatid
breakage-fusion-bridge (BFB) cycle occurred only in the germ cells and endosperm, while the chromosome BFB continued in the
sporophyte, which meant that she could selectively produce persistent variegation in plant tissues.
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Periodical: McClintock, Barbara. "Maize Genetics." Carnegie Institution of Washington Yearbook 41, (1942): 181-186. Article. 6
Carnegie Institution of Washington
Reproduced with permission of the Carnegie Institution of Washington.