In a bivalent,the number of non-sister chroma | vedclass

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(B) bivalent consists of a homologous pair of chromosomes,which contains a total of $4$ chromatids. During meiosis,crossing over occurs between two no

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(B) bivalent consists of a homologous pair of chromosomes,which contains a total of $4$ chromatids. During meiosis,crossing over occurs between two non-sister chromatids of the homologous pair. Since there are $4$ chromatids in total and crossing over involves only $2$ non-sister chromatids,the remaining $2$ non-sister chromatids do not participate in the crossing over process. Therefore,the number of non-sister chromatids that do not undergo crossing over is $2$.

In a bivalent,the number of non-sister chromatids that do not undergo crossing over is .......

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