claim: Kate Walsh played Dr. Addison Montgomery on Grey's Anatomy.
evidence: Endless Forms Most Beautiful  : The New Science of Evo Devo and the Making of the Animal Kingdom is a 2005 book by Sean B. Carroll .. Sean B. Carroll. Sean B. Carroll. It presents a summary of the emerging field of evolutionary developmental biology and the role of toolkit genes .. evolutionary developmental biology. evolutionary developmental biology. toolkit genes. evo-devo gene toolkit. It has won numerous awards for science communication .. The book 's somewhat controversial argument is that evolution in animals -LRB- though no doubt similar processes occur in other organisms -RRB- proceeds mostly by modifying the way that regulatory genes , which do not code for structural proteins -LRB- such as enzymes -RRB- , control embryonic development .. evolution. evolution. embryonic development. embryogenesis. In turn , these regulatory genes turn out to be based on a very old set of highly conserved genes which Carroll nicknames the toolkit .. highly conserved. conserved sequence. Almost identical sequences can be found across the animal kingdom , meaning that toolkit genes such as Hox must have evolved before the Cambrian radiation which created most of the animal body plans that exist today .. toolkit genes. evo-devo gene toolkit. Hox. Hox gene. Cambrian radiation. Cambrian radiation. These genes are used and reused , occasionally by duplication but far more often by being applied unchanged to new functions .. Thus the same signal may be given at a different time in development , in a different part of the embryo , creating a different effect on the adult body .. In Carroll 's view , this explains how so many body forms are created with so few structural genes .. The book has been praised by critics , and called the most important popular science book since Richard Dawkins 's The Blind Watchmaker .. Richard Dawkins. Richard Dawkins. The Blind Watchmaker. The Blind Watchmaker