A gene expressed in the early embryo. Embryos with mutations in zygotic genes are phenotypically abnormal, and this phenotype is dependent on genetic contributions from both parents, i.e., upon the genotype of the zygote, rather than the genotype of the mother or the father alone. Also called zygotic effect gene. Compare with maternal effect gene, paternal effect gene. See Chronology, 1987, Nüsslein-Volhard et al.; 1988, 1989, Driever and Nüsslein-Volhard; 1995, Lewis et al.; bicoid, hunchback, zygotic segmentation mutants.
Subjects: Genetics and Genomics.