Genetically speaking, the only difference between men & women is that where women have two X chromosomes, men have one X & one Y. It is surprising that one chromosome difference out of our total of forty-six can have such an important consequence, but it does. Is this relatively small genetic variance really sufficient to explain the huge differences between the sexes, not just the physical but the psychological, social, even cultural?
Drawing on his own work at the forefront of modern genetics & the exciting theories of evolutionary biology, Bryan Sykes explores the mysteries of the science of sex & gender, & takes a scientific look at what makes men tick. He addresses the most basic issues of why there are only two sexes in humans &, even, why there is sex at all. He also raises more far-reaching questions, such as: Is there a genetic cause for men