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The XY sex-determination system is the sex-determination system found in humans, most other mammals, some insects (Drosophila), and some plants (Ginkgo). In this system, the sex of an individual is determined by a pair of sex chromosomes (gonosomes).
Locus is what the gene's position on a chromosome is called.n humans, there are two types of sex chromosomes: X and Y chromosomes. Genes located on the X chromosome are c â¦ alled X-linked and genes located on the Y chromosome are called Y-linked chromosomes. 4 people found this useful.