Abstract
The meiotic behavior of the univalent chromosome in monosomic (2n-1) types of Nicotiana tabacum var. purpurea is described.Evidence is presented indicating that abnormal behavior of the univalent chromosome may provide the opportunity for new chromosomal rearragements.Various types of aberrant plants appearing in the progenies of the monosomic types are described. These inelude trisomics, triploids, and others having various structural rearrangements of the chromosomes.Monosomism creates a condition of genetical unbalance that may serve as the source of numerical or structural ehromosomal recombinations.
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