"Sex-Ratio" Condition: Unusual Mechanisms in Bark Beetles

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Science  08 Jul 1966:
Vol. 153, Issue 3732, pp. 208-209
DOI: 10.1126/science.153.3732.208


Although males and females occur in similar frequency in the broods of most scolytid beetles, certain individuals of several species produce offspring highly aberrant in the ratio of sexes-all or mostly female. In some instances this condition reflects gynogenesis (parthenogenesis stimulated by mating); in others, a maternally transmitted factor.