Outline the formation of chiasmataThis is a featured page




  • Homologous chromosomes pair together, during Prophase 1 of meiosis, in a process called synapsis.

  • During synapsis, X-shaped structures (called chiasmata) can form between non-sister chromatids.

  • On average, 1-3 chiasmata form per homologous pair.

  • At each chiasma, the maternal DNA can be swapped with the paternal DNA in a process called crossing over.

  • Crossing over produces new combinations of alleles, called recombinants.

  • The process by which offspring get new combinations of alleles, which differ from the parents, is called recombination.

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