Please explain why the answer is #3 ... My understanding is that a chiasma has f

Question

Please explain why the answer is #3 ...

My understanding is that a chiasma has formed between non-sister chromatids at this point.

See figure below for more clarification:

Which of the following outcomes DO NOT happen in a single cross-over event during meiosis? 1) Two parental gametes are produced O 2) Two recombinant gametes are produced 3) A chiasma has formed between sister chromatids 4) A chiasma has formed between non-sister chromatids 5) A novel chromosome is created, containing a new arrangement of genetic material

Explanation / Answer

In single cross over of meiosis, the crossing over occurs between non sister chromatids and rearrangement occurs. Based on this , among the given options, correct option would be a chaisma has formed between non sister chromatids would be the rightful choice.

Option 4 is the answer.

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