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Published in last 50 years
Deterministic selection forces operating at a modifier level within a population lead to the establishment of systems of sex-determination which, under a variety of natural conditions, induce sex-ratios close to 1 : 1.
The morphological and kinetical features of the odonate sex chromosomes are reviewed and trends of the evolution of different modes of sex determination in the order are considered. The cytological conditions in the familyGomphidae are of particular importance for the understanding of the evolution of sex determination in dragonflies and are discussed in detail.