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The genetic basis of pupal color dimorphism in Papilio polyxenes and its maintenance by natural selection.
A survey of the genetic variation in the ability to produce brown
pupae was conducted using 23 broods reared from wild caught females.
In addition a selection experiment was designed to investigate the
genetic basis of the dimorphism. It was concluded that the genetic
basis of the dimorphism is a threshold trait with quantitative genetic
variation underlying the two phenotypes of green and brown pupal color.
It was further concluded that the dimorphism is maintained in nature by
weak stabilizing selection, thus explaining the occurrence of
mismatches in pupal and background color.