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]
Sexual differentiation in humans Chromosomal sex is determined at the time of fertilization; a chromosome from the sperm cell, either X or Y, fuses with the X chromosome in the egg cell. Gonadal sex refers to the gonads, that is the testis or ovaries, depending on which genes are expressed. Phenotypic sex refers to the structures of the external and internal genitalia.[7]