genetic locus
Technical term in genetics referring to a specific, fixed position on a chromosome where a particular gene or genetic marker is located.
Multiple alleles exist at this genetic locus.
遺伝子 (gene) is the unit of heredity, while 遺伝子座 (genetic locus) is the physical location of that gene on a chromosome.
染色体 (chromosome) is the structure that contains genes; 遺伝子座 refers to a specific position on that structure.
Compound of 遺伝子 (gene) and 座 (seat, position), literally 'gene seat'. A calque from English 'genetic locus'.