Which of the following statements is false?

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(C) Crossing over is the exchange of genetic material between non-sister chromatids of homologous chromosomes during the pachytene stage of Prophase-$

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Crossing over occurs between two sister chromatids of the same homologous chromosome.

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(C) Crossing over is the exchange of genetic material between non-sister chromatids of homologous chromosomes during the pachytene stage of Prophase-$I$ of meiosis.Statement $A$ is true as crossing over occurs in Prophase-$I$.Statement $B$ is true as it involves paternal and maternal homologous chromosomes.Statement $D$ is true as it involves non-sister chromatids.Statement $C$ is false because crossing over does not occur between sister chromatids of the same chromosome,as they are genetically identical.

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