By Greg Krukonis PhD, Tracy Barr
Книга Evolution For Dummies Evolution For DummiesКниги Биология Автор: Greg, PhD Krukonis, Tracy Barr Год издания: 2008 Формат: pdf Издат.:For Dummies Страниц: 362 Размер: three ISBN: 0470117737 Язык: Английский0 (голосов: zero) Оценка:Today, most schools and universities provide evolutionary learn as a part of their biology curriculums. Evolution For Dummies will music a category within which evolution is taught and provides an goal medical view of the topic. This balanced advisor explores the background and way forward for evolution, explaining the suggestions and technology in the back of it, providing case reports that help it, and evaluating evolution with rival theories of production, equivalent to clever layout. It will also establish the indicators of evolution on this planet round us and clarify how this concept impacts our daily lives and the long run to return.
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Example text
In some cases, the two populations are so close to becoming different species that all it would take is some minor habitat change to push them that last little bit and turn one species into two. For more detailed information about speciation, head to Chapter 8. The idea of speciation got Darwin into a lot of hot water, and it’s a hot-button issue today because it links organisms to common ancestors, which is all well and good for things like fish, oak trees, and invertebrates. But when you throw humans into the mix — whoa, Nelly.
Although you haven’t actually witnessed evolution, you’re looking at its result: the change in the frequency of particular genes over time. The antibiotic-resistant gene appeared in less than 1 percent of the original bacteria; it appears in 30 percent of the descendents. ) In a nutshell, biological evolution is simply a change in the frequency of one or more genes through time. Scientists collect this sort of data about the occurrence of evolution all the time — not only for bacteria, but also for all sorts of organisms, both simple and complex.
Qxp 16 2/19/08 5:56 PM Page 16 Part I: What Evolution Is In case you’re curious: Survival of the fittest Although he didn’t coin the phrase survival of the fittest, Darwin did make it a household term. Many people assume (erroneously) that it means the natural order mandates that the strong survive and the weak die away. But to Darwin and other evolutionists, survival of the fittest is simply synonymous with natural selection. In other words, those organisms that possess selectively favored heritable characters are the ones that pass their genes into the future with the most success.
