Ionel Sandovici and Carmen Sapienza | Jun 1, 2010 | 4 min read
By Ionel Sandovici and Carmen Sapienza Sticky fingers A single protein recognizes different sequences in different organisms and drives speciation. Computer graphic of a two zinc-finger peptide (yellow) binding to a DNA (red and blue) molecule. © KEN EWARD / BIOGRAFX / SCIENCE PHOTO LIBRARY Homologous recombination physically links together chromosomes at the first division in meiosis by sharing DNA strands between chromosomes. This creates genetic variat