How does DNA still work after recombination?

Question

If you take two computer programs and randomly swapped pieces from each of them. The result is not going to work. It will just be garbage. If you take two novels and randomly swapped chapters the result will be garbage too. How is it than DNA (which is infinitely more complicated) can be combined, some from the father and some from the mother and yet it still somehow works? Can you give a simple example?

Answer 1

Homologous DNA recombination does not swap parts randomly. Instead, this recombination is highly specific and requires a region of homology between two alleles. This region of homology has a statistically low chance of being found anywhere else in the DNA.