A type of natural selection which acts upon individual genes and alleles within an organism's genome. Genic selection occurs whenever a gene or allele reproduces at a rate different from the organism which carries it, for example if an allele is transmitted to more than 50% of the gametes of a heterozygous individual (called "segregation distortion" or "meiotic drive").

From the BioTech Dictionary at http://biotech.icmb.utexas.edu/. For further information see the BioTech homenode.