The source of genetic variation you're describing is called crossing over.

Here's how it works:

* During Prophase I of Meiosis: Homologous chromosomes (one from each parent) pair up and exchange segments of their DNA.

* Result: This exchange creates new combinations of alleles on the chromosomes, increasing genetic diversity.

Crossing over is a key factor in creating the unique genetic makeup of each offspring, contributing to the diversity of life.