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Crossing Genetic Forming Chromatids Describe Process Explain Produces

Front Describe the process of crossing over and explain how it produces genetic variation.
Back Crossing over:
  • Homologous chromosomes pair up, forming a bivalent 
  • Non-sister chromatids become entangled at points called chiasmata
  • They break off and re-join, sometimes resulting in an exchange of DNA forming recombinant chromatids with different combinations of alleles and therefore genetic variation


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