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What is recombinant DNA? How do we cut and paste DNA

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Genetic recombination occurs when blocks of genes from homologous chromosomes are 'switched' by the process of crossing over. During the process of reciprocal recombination:
1. 2 DNA duplex molecules are broken (cut)
2. Broken DNA strands are exchanged, or 'swaped'
3. DNA strands are re-ligated ...