I am a reasonably intelligent person with no biology background, trying to make sense of genetics so I can understand discussions about genetic engineering, medicine, the Human Genome Project, creation-evolution, etc. I have tried to read the genetics sections of biology textbooks to understand what's going on, but I find it hard to get the big picture from those. This book is perfect... it starts right from the beginning, and builds carefully and simply all the way to recombinant DNA, glossing over a few hard details but not making any huge, puzzling leaps like other books seem to. My girlfriend, taking third year undergraduate genetics, was astonished at how much material was covered so clearly in such a small book. The book is also fascinating as a study of how science really works. I'm ready for more genetics now!