chromosome exchange

In each generation, the maternal and paternal versions of each chromosome exchange sections, shuffling the genetic material.

It was localized to the long arm of chromosome 17 by chance when researchers discovered chromosome exchanges between chromosome 17 with chromosome 1 and 22.

The reason is that the Y chromosome exchanges genetic information just at its tips with its counterpart, the X chromosome, leaving the main body of the Y to change only by successive random alterations in its DNA.