Abstract

1. 1. The adult life span of Mormoniella vitripennis was influenced by the kinds of genes present rather than by the number of sets of chromosomes. 2. 2. Diploid males were more resistant than haploid males to ionizing radiation. Diploid and triploid females are equal in radiation sensitivity. 3. 3. These data do not support the somatic mutation theory of aging and indicate further that the types of injury leading to natural aging are different from those leading to radiation-induced decrease in life span. 4. 4. Although the data indicate that some type of nuclear injury is induced by ionizing radiation, the precise nature of the injury is still obscure.

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