Crossing Over in Meiosis

Crossing over is an important step in meiosis. It happens during prophase I, when homologous chromosomes pair up closely. This pairing lets matching DNA segments exchange places.

The exchange occurs between non-sister chromatids of homologous chromosomes. The result is a new combination of geneti...

In sexually reproducing organisms, such as humans, offspring inherit one set of chromosomes from each parent.

During the formation of germ cells, such as sperm or eggs, homologous chromosomes inherited from each parent exchange DNA segments. This process is called crossing over.

Before cell division, in the S phase of the cell cycle,...