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(1) In an F1 population of N. digluta [Female] x N. tabacum [male] a single haploid tabacum plant was secured in a population of 173 individuals. (2) It is suggested that the occasional pure sylvestris plants obtained in backcrosses of F1 sylvestris-tabacum [Female] x sylvestris [male] may arise from diploid merogony. (3) No detectable influence of maternal cytoplasm was discernible in the above described instances.
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Clausen et al. (1929) studied this question.
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