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Etymology: L, trans + configurare, to form from
1 an arrangement in which the dominant allele of one pair of genes and the recessive allele of another pair are on the same chromosome.
2 an arrangement in which at least one mutant gene and one wild-type gene of a pair of pseudoalleles are present on each chromosome of a homologous pair. Also called trans arrangement, trans position. Compare cis configuration.
3 in chemistry, a form of geometric isomerism in which two substituent groups occur on opposite sides of a structure such as a ring or a double bond. Also referred to as E (entgegen) configuration. Compare cis configuration.