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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).
All 46 chromosomes. No, sex cells have a half set of chromosomes. 23, one from each pair. That is correct. 23, pairs 1-11 and one selected randomly from the remaining pairs. Human sex cells do have 23 chromosomes, but not these 23. 23, 11 random pairs and one extra. Human sex cells do have 23 chromosomes, but not these 23. None, egg cells don't have chromosomes. No, sex cells do have chromosomes. Meiosis reduces chromosome number so that sex cells (eggs and sperm) have a half set of chromosomesâone homolog of each pair. This is the haploid number.