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...ancestor change so that it could produce two-legged primates? One part of the answer is that mutations over time altered genes that encode proteins, and some of those changes have been favored by natural selection. But that does not mean that our genome - the sum total of our human DNA - is a finely tuned collection of protein-coding genes. In fact, a lot of mutations that all humans carry neither helped nor harmed our ancestors. They spread just by chance. And a lot of our genome is not made up of protein-coding genes. In fact...
...like a genetic cookbook, using four molecular "letters" to spell out recipes for everything from hormones to heart valves. Biologists today are reading the 3.5 billion letters in the human genome as well as the DNA from thousands of other species, and they've amassed vast databases of genetic information that they can rummage through to learn about how life evolved...
...hardcopy of magazine or PDF.] DARWIN TODAY Species share a common ancestry, like branches on a tree Genetic studies confirm that different species have evolved from common ancestors. But DNA has also jumped from one species to another - turning parts of the tree of life into a web Humans evolved from apes in Africa Evidence from DNA indicates that chimpanzees and bonobos are the closest living relatives to humans. Fossils document the course of human evolution in Africa from apelike ancestors over the past 7 million years Natural selection is a powerful force driving evolution Natural selection's fingerprints...
...when Clinton goes to China, questions to do with climate change must be at the top of the agenda. For example: Where can we cooperate on energy efficiency? Can the U.S. and China find ways to jointly profit from the development of low-carbon economies? Currencies, Tibet, human rights, Taiwan and other important questions should not be forgotten. But a new united front to address climate issues would help bolster the larger edifice of Sino-U.S. relations, making it easier to deal with these other contentious issues...
...radical idea. Everyone I knew at Harvard had always dated the same kinds of people: Classics concentrators, Hist & Lit boys, the occasional social theorist. My female friends had converged on an ideal type. Emaciated and elusive: the Humanities Heartbreak. By senior year, everyone was getting tired of this—even our parents. “The next time you see a skinny, neurotic boy,” my friend’s mother advised, “don’t date him.” Could people like us find love outside the humanities? To freshmen, this question...