I recommend this edition because it includes chapters on epigenetics which was missing from previous books on the subject. You can view DeGrasse discussing epigenetics on Nova. This book is straightforward and never sensationalist. It plods through data and description reliably. Though the varnish applied to Mendel's legacy is standard in all texts, there is a debate taking place as to the actual place he holds in the pantheon of genetic discovery. A simple monk in a garden working with peas, he discovered the heredity ratio and found a way to calculate generations, but, because of presentism, people of the present time projected more onto him then he deserved credit for, according to one write. In other words, much of the stuff he is credited for would actually confuse him and befuddle him. The reasons are interesting. I read a paper on it and will update this review with more detail when I get a chance.