The Puzzle of Aspirin and Sex

To understand the present, the geneticist Luigi Luca Cavalli-Sforza says that sexual differentiation probably emerged with the appearance of eukaryotes at least 2 billion years ago, and Y emerged from .

Abstract

Recently, in New York, the geneticist Luigi Luca Cavalli-Sforza began a brilliant seminar with this introduction: "To understand the present, you have to understand history, and to understand biology, you have to understand evolution, because evolution is the history of biology." Although Cavalli-Sforza's life of exploration along the branches of the human genetic tree has led him to conclude that there is no genetic basis for race,1 there is most obviously a genetic basis for sex. So powerful is la différence that sexual differentiation probably emerged with the appearance of eukaryotes at least 2 billion years ago, Y emerged from . . .