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allele one of several forms of a gene responsible for hereditary variations, usu. produced by mutation.
cistron in biology, the smallest strand of DNA needed for the synthesis of one polypeptide; gene.
dominant in genetics, of a gene or trait that masks the influence of a recessive when the two appear together. (Cf. recessive.) [1/4 definitions]
genetic drift evolutionary change because of mutations that result from random changes in gene frequency in a small population and that become established in that population.
hypostasis the suppression or concealment of one gene by another gene that is not its allele. [1/4 definitions]
locus the position of a gene on a chromosome. [1/3 definitions]
mutate to display or cause to display a physical trait or characteristic that is different from one's parent or parents as a result of a change within a gene or chromosome.
sex-linked of a gene or genetic trait, carried on the chromosome that determines gender.
unit character a characteristic or trait determined by one gene or a gene pair.