egg-polarity gene
A gene whose product distribution in the egg determines the anterior-posterior axis of subsequent development. Best characterized in Drosophila : see bicoid, maternal-effect gene.

Dictionary of molecular biology. 2004.

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  • maternal-effect gene — Gene, usually required for early embryonic development, whose product is secreted into the egg by the mother. The phenotype is thus determined by the mother s, rather than the egg s, genotype, cf. zygotic effect gene. See also egg polarity gene …   Dictionary of molecular biology

  • gap gene — Segmentation genes involved in specifying relatively coarse subdivisions of the embryo. They are expressed sequentially in development between egg polarity genes and pair rule genes. In Drosophila, there are at least three such genes, eg. Kruppel …   Dictionary of molecular biology

  • bicoid — An egg polarity gene in Drosophila, concentrated at the anterior pole of the egg, and required for subsequent anterior structures. A maternal effect gene …   Dictionary of molecular biology

  • oskar — An egg polarity gene in Drosophila, concentrated at the posterior pole of the egg, and required for subsequent posterior structures. A maternal effect gene …   Dictionary of molecular biology

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