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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).
Body cells have pairs of chromosomes while sex cells have only single sets of chromosomes. The human body cells have 22 pairs of autosomes and 1 pair of sex chromosomes for â¦ a total of 23 pairs or 46 chromosomes.Sex cells for humans will have half of that (because they are not paired) so a total of 23 chromosomes.6. The cells of the human body, for example in the liver, brain, and muscles, contain two sets of chromosomes, and are called diploid. There are 23 chromosomes in each set, â¦ and we inherit 23 from each parent. 2 people found this useful.