The Jimson weed, a species belonging to the nightshade family of plants. It is found all over North America as a roadside weed. The plant is dangerous to eat, since it synthesizes a variety of toxic and hallucinogenic alkaloids (q.v.). D. stramonium has 12 pairs of chromosomes. A set of trisomics was developed, each with a different chromosome in triplicate. Each primary trisomic differed from normal and from each other in characteristic ways. This suggested that each chromosome contained genes with morphogenetic effects and that the abnormal phenotype that characterized each trisomic was the result of increases in the relative doses of these genes. See Classification, Plantae, Angiospermae, Dicotyledonae, Solanales; Chronology, 1920, Blakeslee, Belling, and Farnham; aneuploidy, haploid sporophytes, haploidy, polyploidy.
Subjects: Genetics and Genomics.