Abstract

Phaulacridium vittatum is polymorphic for three colour pattern morphs involving the presence or absence of two white stripes on the head, pronotum and wings. The polymorphism is controlled by alleles at a single autosomal locus with the striped phenotype dominant. An examination of 47 populations in south-east Australia revealed a marked cline in morph frequency correlated with latitude. Possible reasons for the existence of the cline are discussed.

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