Which of the following best describes what happens during a cross-over event?

Tetrads change orientation as they line up along the center of the cell.

Chromatids of homologous chromosomes exchange corresponding segments.

X and Y sex chromosomes overlap and combine together during metaphase.

Spindle fibers overlap and attach to the wrong chromosomes during anaphase.

Question

Which of the following best describes what happens during a cross-over event?

 Tetrads change orientation as they line up along the center of the cell.

 Chromatids of homologous chromosomes exchange corresponding segments.

 X and Y sex chromosomes overlap and combine together during metaphase.

 Spindle fibers overlap and attach to the wrong chromosomes during anaphase.

anonymous · Answer

It's the second one. 
Chromatids of homologous chromosomes exchange corresponding segments.