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Transformer (tra) is the key gene that turns on the sex‐determination cascade in Drosophila melanogaster and in some other insects. The honeybee Apis mellifera has two duplicates of tra, one of which (complementary sex determiner, csd) is the primary signal for complementary sex‐determination (CSD), regulating the other duplicate (feminizer). Two tra duplicates have been found in some other hymenopteran...
Ty1‐copia retrotransposons are widespread and diverse in insects. Some features of their hosts, such as mating and genetic systems, are predicted to influence the spread of selfish genetic elements like Ty1‐copia. Using part of the reverse transcriptase gene as a reference, we experimentally surveyed Ty1‐copia elements in eight species of fig wasps (Hymenoptera: Chalcidoidea), and performed an in silico...
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