How does crossing over add to the genetic diversity of sexually reproducing organisms?
it involves segments of two homologous chromosomes trading places.
it involves random segregation of the homologous chromosomes to each daughter cell.
it involves fertilization of an ovum by any one out of millions of sperms.

It involves segments of two homologous chromosomes trading places.

Explanation:

Crossing over is the process of exchange of genetic segments between two non-sister chromatids of a homologous chromosome pair. It occurs in pachytene of prophase I of meiosis I. The exchange of segments between non sister chromatids of a homologous chromosome pair creates new gene combinations. So, crossing over creates genetic diversity by adding new gene combinations to gametes.

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