physical location of a gene on a chromosome is called
Gene mapping Gene mapping describes the methods used to identify the locus of a gene and the distances between genes.[2]
Promoter (genetics) In genetics, a promoter is a region of DNA that initiates transcription of a particular gene. Promoters are located near the transcription start sites of genes, on the same strand and upstream on the DNA (towards the 5' region of the sense strand). Promoters can be about 100â€“1000 base pairs long.[1]