The main difference between Darwin's theory of evolution and Lamarck's theory of evolution is that Lamarck's was proposed before people were ready to believe in evolution. Darwin did not incorporate the notion of God into his theory. Lamarck did not incorporate the notion of God into his theory. Lamarck did not believe that individuals varied. Darwin believed change occurred from one generation to the next while Lamarck believed change occurred during individuals' lifetimes. The problem with Lamarck's proposal of the inheritance of acquired characteristics was that the Earth was very old. The Earth was not very old. Individuals do not acquire characteristics during their lifetimes. Nobody read his works. Evolution had already been proposed. The reason described in the lectures for why elephants do not have wings is based upon the constraint of small population sizes. Disequilibrium. Physics and chemistry. Correlated characters. Natural selection not being able to look ahead. What eventually prompted Charles Darwin to publish his theory of natural selection? His wife finally made peace with the proposal. His father passed away. He completed further research into the forces of evolution. Someone else developed the same theory. He became financially secure. Someone studying the remains of an Egyptian city from 2,000 B.C. would probably be working from the perspective of archaeology. Cultural Anthropology. Physical Anthropology. Linguistic Anthropology. Ethnology. Suppose that the drought observed on Daphne Major affected other islands in the Galapagos chain as well. Imagine that tortoises on a nearby island spend more time in the water when food becomes scarce. Smaller individuals are more likely to die in the water since they do not have as much strength to combat the swirling currents. What would you expect size of the tortoises be many generations after the drought conditions went away? Size would stay large since a drought could occur in the future. Size would stay large since variation for small individuals would be all used up. Size would stay large since bigger is always better. Size would return to pre-drought conditions since there are costs to having a large body size. Size would return to pre-drought conditions since natural selection often has an ideal in mind which is very difficult to change unless the environment undergoes a radical shift. Who argued that God was responsible for the design of organisms? Erasmus Darwin. Charles Lyell. William Paley. Thomas Malthus. Jean-Baptiste Lamarck. As described in the lectures, prairie dogs have few predators. Live in populations that are not subject to natural selection. Who are more aware of predators may have an evolutionary advantage. Can grow quite large, sometimes up to 30 pounds. Often attack people playing golf. What happened to beak size of the ground finches on the Galapagos during the drought conditions? Beak size increased. Beak size decreased. Beak size remained the same since the environment did not change. Beak size remained the same since all birds could eat the large seeds. None of the above. An important implication of Darwin's third postulate (about inheritance) as described in lectures and the textbook is that parents with successful variations pass them on to offspring. Successful variations become more numerous in successive generations. Offspring see how their parents have adapted to the environment and copy them. All of the above. (b) and (c) above.
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The main difference between Darwin's theory of evolution and Lamarck's theory of evolution is that Lamarck believed change occurred during individuals' lifetimes, while Darwin believed change occurred from one generation to the next. Show moreā¦
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Characters: Charles Darwin: originally educated as an Anglican clergyman with the belief of a literal interpretation of the Bible, he instead established the theory of natural selection, primarily after his 5-year expedition on the HMS Beagle and its stop in South America. Robert Fitzroy: captain of the HMS Beagle. He selected Darwin as his "science officer." Fitzroy, being religious, was displeased at the development of the ideas of evolution. Erasmus Darwin "Ras": older brother of Charles. Ras supported and encouraged Charles' thinking (and publication of the work). Bishop Samuel Wilberforce: Lord and Bishop of Oxford, Fellow of the Royal Society, critic of Darwin's work. Emma (Wedgewood) Darwin: wife (and first cousin) of Charles. Richard Owen: anatomist at the British Museum of Natural History. Often a critic of Darwin's ideas, agreeing there is evolution, but not in the manner Darwin suggests. Thomas Henry Huxley: possibly the largest scientific supporter of Darwin; his debate with Bishop Wilberforce is an important moment in the acceptance of Darwin's ideas. Questions to answer as you watch the video. They are in order. 1. Why was Darwin's idea so dangerous, especially in Britain at the time? 2. Darwin presented evidence of gradualism he saw from his trip. What geological and fossil evidence did he present? 3. How did Darwin connect gradualism and geology to the appearance of new and different finches in the Galapagos Islands? 4. What does Darwin hypothesize about living creatures if the Earth underwent significant changes in its history? 5. What does Darwin hypothesize happened to the creatures shown by his fossils? 6. What was Darwin's realization after looking at the finches and their different beaks? 7. In the tree of life, what do branches represent? South American Expedition 8. According to the interviewed expert(s), what were Darwin's biggest insights from his observations? 9. How is the leaf mantis highly modified from the ones in North America? Why is this an advantage? 10. The differences between the lowland and highland Andes environments would force species to do what? 11. What adaptations are shown in hummingbirds for each environment? 12. At what point are two populations considered different species? 13. What tool exists now that did not when Darwin wrote his ideas? Using this technology, how long ago did the two hummingbirds diverge? INTERLUDE 1 14. What are some reasons why Emma seems skeptical of Charles' theory and the selective breeding example? 15. What part of Darwin's ideas does the stoning of the carriage show? 16. Describe the theory of natural selection, using the ideas of individual variation, limited resources, and reproduction? 17. According to Darwin, where do humans fit into his ideas? HIV RESISTANCE 18. At the time of this documentary, 19 drugs were available to treat HIV. Using the theory of natural selection, explain why drug-resistant HIV strains arise. How does the speed of change in viruses compare to animals? 19. Does natural selection have a plan or predictability? 20. Explain how having a patient stop temporarily taking HIV drugs helped combat the emergence of resistant viruses? INTERLUDE 2 21. According to Darwin, why do moles have small eyes and owls have big eyes? 22. Richard Owen showed Darwin sketches of several different animal skeletons. What did both find striking about the structure? How did each explain that observation? EYE STORY 23. The eye is often called the "perfect" organ. How is the eye actually imperfect, and why are these imperfections important to understanding its evolution? 24. The documentary presents a series of possible intermediary steps in the formation of a complex eye organ. Explain why natural selection would favor change and give an example of a modern organism that still relies on the design. a. cup-shaped vision organ compared to the primitive flat patch of sensory cells b. constricted eye openings c. A clear convex lens in front of the opening INTERLUDE 3 and the BRAIN 25. Why was Annie's death important in Darwin's thinking and decision to publish? 26. The publication of On the Origin of Species drew controversy towards Darwin and Huxley, mostly for the suggestion that humans arose by the same natural laws as all animals. What did Bishop Wilberforce and Richard Owen argue against Darwin (and Huxley's) ideas? How did Huxley counter this argument? 27. What other evidence has emerged since the publication of Darwin's book to support the close evolutionary relationship between humans and chimpanzees?
Sri K.
Both Charles Darwin and Alfred Wallace started their scientific careers as naturalists hired on board of ships sailing around South America. Darwin was the first one to go on this long journey. They both had to collect and catalog as many new species of animals, plants, and fossils as possible. After a long five-year voyage, Darwin came back to London with a huge collection of specimens. The first journey for Wallace was not so successful due to illness on the ship. During his journey, Darwin spent almost five weeks on the Galapagos Islands, which at first he called "The Enchanted Isles". The time on the Galapagos Islands gave Darwin important clues for his future theory of natural selection; each island had different species of turtles and mockingbirds. In the years to come, Darwin often thought back to the geology, the fossils, and the animals that he'd seen during his journey. The best explanation for what Darwin saw in the GalĆĀ”pagos was that species changed into new species. Over time, one kind of mockingbird somehow became three. Tortoises multiplied into different forms. In a simple, crude sketch, Darwin drew his radical new picture of life. Any species can give rise to new and slightly different species. At that time, this type of thinking was considered heretical. It ran against church teachings and what most Europeans believed, including most scientists. When Darwin was establishing his position in London as a well-known naturalist and scientist, Wallace set out for another journey. He spent 8 years on the new voyage to the Malay Archipelago in Indonesia. He collected and studied animals as he traveled from island to island in a 14,000-mile journey. Wallace was especially captivated by butterflies. His favorite group is called "birdwings," after their shape and large size. Having explored jungles on opposite sides of the globe, he could compare where different groups of animals lived and asked why they are found where they are. Island by island, Wallace noted two groups of mammals living in the Indonesian region: those with pouches and those without. Animals on the eastern islands resemble those of Australia; animals to the west, those of Asia. It's as if a line splits the archipelago. It will be dubbed "The Wallace Line." Because of his impact on connecting biodiversity with geological localization, Alfred Wallace is considered a father of biogeography. The work of both Darwin and Wallace was influenced by the English economist Thomas Malthus, who noted that human populations are held in check by famine, disease, and death. Without death, any species would quickly overrun Earth. Animal populations tend to hold steady because huge numbers of young die every generation. If individuals have a feature/variation that gives them even a slight edge, they will survive, reproduce, and in time outnumber those without the advantageous feature. Darwin called this process "natural selection". In 1858, both Darwin and Wallace presented this theory together in London. Darwin published his own masterful full-length book in 1859, where he described the process of artificial and natural selection and explained how living organisms could have evolved from other species. The Origin of Species became one of the most influential books ever published. It was an instant sensation that signaled the birth of modern biology. Wallace eventually wrote a book on evolution. He gave it the title Darwinism.
Alexander B.
After reading an essay written by Thomas Malthus, both Charles Darwin and Alfred Wallace became aware of the potential for populations to increase beyond their environment's capacity to provide for all individuals, resulting in competition for survival. QUESTION 2 When natural selection is operating, which of the following phenomena is likely to occur? a. Mutations that occur in one of an organism's cells will gradually spread to the rest of the cells. b. The evolution of a population will be driven by random natural events. c. The characteristics of individuals within a population will evolve during their lifetime. d. Some individuals within a population will have greater reproductive success than others. QUESTION 3 Refer to Figure 14.30 in the textbook. What do all of these birds have in common? a. They all live in Africa. b. They are all descended from a common ancestor. c. They are products of artificial selection. d. Their geographic distribution can be explained by plate tectonics. QUESTION 4 One common criticism about evolution is that the actual process of evolutionary change has never been observed. How might an evolutionary biologist respond to this criticism? a. Biologists routinely observe and document genetic changes in populations; peppered moths and cliff swallows are just two of hundreds of examples. b. Prehistoric peoples living in North America observed the gradual changes in the horse and documented these changes in cave paintings. c. Mutation, which is the source of genetic variation, produces variability that is too small to be measured, however, given enough time the accumulation of such small changes will become evident. d. Biologists are confident that evolution occurs, however, the time required for evolutionary change is much longer than the human lifespan. QUESTION 5 Genetic variation is based on a. the accumulation of mutations in somatic cells (as opposed to gametes). b. differences in DNA sequences between the individuals in a population. c. the formation of new combinations of alleles during asexual reproduction. d. the inheritance of alleles that are accumulated during an individual's lifetime. QUESTION 6 Among individuals in a population, the ultimate source of heritable differences that drive natural selection is a. industrial pollution. b. gene flow. c. continental drift. d. gene mutation. QUESTION 7 Which of the following statements best describes what happens in gene flow? a. Chance events alter a population's gene pool. b. New individuals that join a population contribute their alleles to its gene pool. c. Alleles that make an individual more successful move from one population to another. d. Crossing-over creates new combinations of alleles during gamete formation. QUESTION 8 Biological evolution is best defined as a. changes in any characteristics of a population over time. b. the characteristics that improve a particular organism's chances of survival. c. random oscillations in the genetic makeup of a population. d. the change in the allele frequencies of a gene pool over time. QUESTION 9 The evolutionary effects of genetic drift are a. usually random and unpredictable. b. shaped by nonrandom selective forces. c. indistinguishable from those produced by natural selection. d. most obvious in large populations. QUESTION 10 With which of the following statements would Darwin be most likely to DISAGREE? a. Natural selection is the mechanism by which biological evolution takes place. b. Evolution is best viewed as a purposeful and directed change over time. c. The fossil record supports the view that biological evolution has occurred. d. Individuals within a population vary in the characteristics they possess.
Adi S.
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