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.

zale101 · Answer

Crossing over occurs during meiosis I, and is the process where homologous chromosomes pair up with each other and exchange different segments of their genetic material to form recombinant chromosomes.

D. Chromatids of homologous chromosomes exchange corresponding segments. 
is the answer

zale101 · Answer

http://en.wikipedia.org/wiki/Chromosomal_crossover

anonymous · Answer

Chromatids of homologous chromosomes exchange corresponding segments is the right answer.