新视野大学英语Book4-7课件Research into Population Genetics.ppt

;Research into Population Genetics; Columbus Christopher Columbus, an Italian-born master navigator (born in Genoa, Italy in 1451 and died at Valladolid, Spain in 1506) who sailed in the service of Spain, is commonly described as the discoverer of the New World — America. His four transatlantic voyages (1492－1493, 1493－1496, 1498－1500, and 1502－1504) opened the way for European exploration and colonization of the Americas. ;It is as the result of Columbuss “discovery” that the New World became part of the European world. ;Our bodies are comprised of trillions of microscopic units called cells. Cells in turn are built up from many specific types of molecules, both large and small. The large molecules or macromolecules include polysaccharides, nucleic acids and proteins. The flow of genetic information is from DNA to RNA to Protein. Each protein is a linear polymer of a specific sequence of 20 different amino acids. ;DNA is also a linear polymer comprised of 4 types of nucleotides. The sequence of amino acids in each protein is encoded by a segment of DNA called a gene. Three consecutive nucleotides in a gene encode a single amino acid in the corresponding protein. The genetic code is universal among all living things. ;The Basques are a people who live in a small region that straddles the border of Spain and France from the sea in the west into the Pyrenees in the east. The Basque population is distinguished physically by a high incidence of Rh Negative factor in the blood. No one knows exactly where the Basques came from. ;Some say they have lived in that area since Cro-Magnon man first roamed Europe. Estimates of how long they have lived there vary from 10,000 to 75,000 years. Some say they are descended from the original Iberians. More fanciful theories exist, as well. One is that the Basques are the descendents of the survivors of Atlantis. ;Understanding Genetics - Peter Atkins Interview ; Main idea of the text ? The passage focuses on the latest res