Swapping between human sex chromosomes occurs more often than previously thought say researchers challenging the widely held assumption that genetically there is a strict boundary that suppresses swapping between the X and Y sex chromosomes in humans. Studying our sex chromosomes has consequences for human health and for trying to understand our history said Melissa Wilson Sayres from Arizona State University. To me understanding the evolution of the X and Y is so important because we need to understand that there are all of these variations in the genetics of sex determination she added. All of human diversity is spooled
