Meiotic spindle irregularities in Mentha piperita, M. spicata, and six of their interspecific hybrids were investigated, including both timing and structural variation in spindle development and behavior. These spindle abnormalities are dependent upon the action of a gene transmitted from M. spicata to all its offspring. The effect of the gene is to induce an unstableness of spindle form and behavior which is subject to environmental differences. The gene exerts no directive influence on the spindle change, for irregularities were of many kinds.
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Swanson et al. (1942) studied this question.
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