The honeybee haplodiploid sex determination system depends on genetic variation at the complementary sex-determiner (csd) locus. In closed populations of honeybees, especially those undergoing selective breeding, the number of csd alleles can drop such that brood viability is affected. Here we present two polymerase chain reaction tests that allow the discrimination of csd alleles. Such tests should find utility in bee breeding programmes allowing the tracking and maintenance of csd alleles through successive generations.genetic test / honeybee breeding / sex determination / high-resolution melting
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