It turns out that the rigid "line in the sand" over which the human sex chromosomes—-the Y and X—- go to avoid crossing over is a bit blurrier than previously thought. opposite to the current scientific consensus,Arizona State University assistant professor Melissa Wilson Sayres has led a research team that has shown that X and Y DNA swapping may occur much more often. And this promiscuous swapping, may in turn, or aid in our understanding of human history and diversity,health and disease, as well as blur rigid chromosomal interpretations of sexual identity.
Source: phys.org