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| Modern Genetic Analysis Chapter 13. Transposable Genetic Elements Controlling Elements in Maize Figure 13-27. Mosaicism through transposon mutagenesis in corn. These seeds represent genotypes in which a transposon has inserted into a gene that produces anthocyanin. Therefore, the cells of these seeds are predominantly lacking anthocyanin and are yellow; let us call the genotype AT /AT. However, in the course of development, the transposon can occasionally exit from the gene, forming a revertant cell of genotype A /AT. Cell division will result in a clone of revertant cells and hence a patch of pigmented cells. The three different rows represent corn lines in which the transposon exits early (large spots), late (small spots), or in between (intermediate spots). (A. J. F. Griffiths)

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