Chances are you've seen an illustration of DNA's double-helix structure and even ... Genes determine whether you have brown eyes or blue, long toes or short, and much, much more.

Each is optimized for use in the brain, the liver, the skin, and so on. Remarkably, the DNA inside all these cells is exactly the same. What makes the cells differ from one another is that ...

after a successful search for homology with a template DNA (purple, red and green). The template DNA is opened up in the middle, with one of its strands forming new double-stranded DNA with the ...