Homologous recombination is a very essential DNA fixing and dividing mechanism. When it goes wrong, cells lose their ability to repair damaged DNA, which can lead to mutations causing uncontrolled proliferation and cancer.
Here, this Blackwell Publishing artwork deftly sums up the complicated maze of homologous recombination. Of course, you are not expected to know it all, but to have a look can boost your ability to understand the pathogenesis of various tumors, besides helping you out in pure Biochem.