Crossing-over involves the exchange of genetic information between
A. homologues.
B. chromatids.
C. sister chromatids.
D. sex chromosomes.

Question

Crossing-over involves the exchange of genetic information between
A. homologues.
B. chromatids.
C. sister chromatids.
D. sex chromosomes.

photon336 · Answer

@3dchick 

Check out the figure out below: 

|dw:1451878676371:dw|

anonymous · Answer

D. sex chromosomes

anonymous · Answer

I believe it should be B. Non-sister chromatids. If you look at the diagram given by @photon336, then you can see that there is crossing over between the blue and the purple. They are non-sister chromatids, as they are alleles in a homologous pair.