Shaping of developmental gradients through selection on multiple loci in Antirrhinum.

Abstract excerpt

Development depends on precise shaping of molecular gradients, but how natural selection acts to establish precision is unknown. Here, we analyze genes that control differences in the gradient of yellow flower color between two varieties of snapdragon (Antirrhinum). We show that these differences depend, in part, on cis-regulatory variation in the pigment biosynthetic gene, FLAVIA (FLA). FLA interacts...

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