VariousWords beta
Noun
Definition: A gene, in Drosophila and related flies, that specifies which end of an egg will be the anterior and become the fly's head by setting up a concentration gradient of the Bicoid protein.
Definition: A protein, in Drosophila and related flies, specified by the bicoid gene, the concentration gradient of which serves to specify which end of the egg will become the head of the fly.