Question

which correctly describes crossing over?
the process whereby non - sister chromatids exchange genetic material
the process whereby homologous chromosomes are pulled to opposite poles of the cell
the process whereby sister chromatids are pulled to opposite poles of the cell
the process whereby homologous chromosome pairs align randomly along the metaphase plate

Explanation:

Crossing over occurs during meiosis. It specifically involves non - sister chromatids of homologous chromosomes exchanging genetic material. This process increases genetic diversity.
The second option describes anaphase I (pulling of homologous chromosomes to opposite poles). The third option describes anaphase II (pulling of sister chromatids to opposite poles). The fourth option describes independent assortment (random alignment of homologous chromosome pairs along the metaphase plate).

Answer:

the process whereby non - sister chromatids exchange genetic material