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The silkworm,Bombyx mori,is the economically important insect domesticated more than 5000 years.Most economic traits of silkworm attentioned by the breeders are quantitative traits.The QTL mapping has always been the important method to study the genetic architecture of the quantitative traits.However,the widely used QTL models are not well compatible with the silkworm,because of ignoring the achiasmata and gender effect.