Which inference s about this population might be true? Which of the following must exist in a population before natural selection can act upon that population? Which of Darwin's ideas had the strongest connection to Darwin having read Malthus's essay on human population growth?
If Darwin had been aware of genes, and of their typical mode of transmission to subsequent generations, with which statement would he most likely have been in agreement? If natural selection can change one gene's frequency in a population over the course of generations then, given enough time and enough genes, natural selection can cause sufficient genetic change to produce new species from old ones.
Currently, two extant elephant species X and Y are placed in the genus Loxodonta, and a third species Z is placed in the genus Elephas. Thus, which statement should be true? Species X and Y share a greater number of homologies with each other than either does with species Z.
The rise of methicillin-resistant Staphylococcus aureus MRSA can be considered to be an example of artificial selection because. In a hypothetical environment, fishes called pike-cichlids are visual predators of algae-eating fish in other words, they locate their prey by sight. If a population of algae-eaters experiences predation pressure from pike-cichlids, which of the following is least likely to be observed in the algae-eater population over the course of many generations?
DDT was once considered a "silver bullet" that would permanently eradicate insect pests. Today, instead, DDT is largely useless against many insects. Which of these would have been required for this pest eradication effort to be successful in the long run?
If the bacterium Staphylococcus aureus experiences a cost for maintaining one or more antibiotic-resistance genes, then what should happen in environments from which antibiotics are missing? If two modern organisms are distantly related in an evolutionary sense, then one should expect that.
Structures as different as human arms, bat wings, and dolphin flippers contain many of the same bones, these bones having developed from very similar embryonic tissues. How do biologists interpret these similarities?
Over evolutionary time, many cave-dwelling organisms have lost their eyes. Tapeworms have lost their digestive systems. Whales have lost their hind limbs. How can natural selection account for these losses? Under particular circumstances that persisted for long periods, each of these structures presented greater costs than benefits.
Which of the following pieces of evidence most strongly supports the common origin of all life on Earth? Logically, which of these should cast the most doubt on the relationships depicted by an evolutionary tree? Relationships between DNA sequences among the species did not match relationships between skeletal patterns. Which of the following statements most detracts from the claim that the human appendix is a completely vestigial organ?
Members of two different species possess a similar-looking structure that they use in a similar fashion to perform the same function. Which information would best help distinguish between an explanation based on homology versus one based on convergent evolution?
The two species share many proteins in common, and the nucleotide sequences that code for these proteins are almost identical. Ichthyosaurs were aquatic dinosaurs. Fossils show us that they had dorsal fins and tails, as do fish, even though their closest relatives were terrestrial reptiles that had neither dorsal fins nor aquatic tails. The dorsal fins and tails of ichthyosaurs and fish are. Both ancestral birds and ancestral mammals shared a common ancestor that was terrestrial.
A response will appear in the window below the question to let you know if you are correct. Be sure to read the feedback. It is designed to help you learn the material. You can also learn by reading the feedback for incorrect answers. Charles Darwin was best known in the 19th century for: a creating the idea of evolution b creating the idea of uniformitarianism c making the idea of evolution acceptable for scientists and the educated general public d all of the above 2.
Charles Darwin's ideas concerning the causes of evolution were probably formulated in his mind: a while he was still a student at Cambridge University b before he began his voyage of exploration around the world on H. Beagle c during his voyage on H. Through careful observation, Charles Darwin came to understand that: a populations of plants and animals in nature most often consist of individuals that are clones of each other b those individuals whose variation gives them an advantage in staying alive long enough to reproduce are more likely to pass their traits on to the next generation c populations of a species that become isolated from others by adapting to different environmental niches quickly become extinct d all of the above 5.
Which of the following statements is true about Charles Darwin? The example of the peppered moths living near English industrial cities demonstrates that: a a change in an environment can result in the evolution of species living there b evolution occurs so slowly that it is not possible to determine that it has happened in less than a million years c the environment near these cities has always favored dark colored moths 7. Which of the following statements about Darwin is true? But even as a child, Darwin expressed an interest in nature.
Later, while studying botany at Cambridge University, he was offered a chance to work as an unpaid naturalist on the HMS Beagle , a naval vessel embarking on an exploratory voyage around the world. In the course of nearly five years at sea — during which time the Beagle surveyed the coast of South America and stopped in such places as Australia and, most famously, the Galapagos Islands — Darwin took advantage of countless opportunities to observe plant and animal life and to collect both living and fossilized specimens for later study.
After the Beagle returned to England in October , Darwin began reflecting on his observations and experiences, and over the next two years developed the basic outline of his groundbreaking theory of evolution through natural selection.
But beyond sharing his ideas with a close circle of scientist friends, Darwin told no one of his views on the origin and development of life. Indeed, he did not publish his now-famous volume, On the Origin of Species by Means of Natural Selection , until , more than 20 years after he had first formulated his theory.
On the Origin of Species may never have been written, let alone published, if it had not been for Alfred Russel Wallace, another British naturalist who independently proposed a strikingly similar theory in This being the age of Victorian gentlemen, it was agreed that the two scientists would jointly publish their writings on the subject.
The following year, Darwin published On the Origin of Species , a lengthy, fleshed-out treatment of his ideas on evolutionary theory. The book was an immediate bestseller and quickly set off a firestorm of controversy. Yet the concept of species adaptation was not so radical at the time. Scientists had been debating whether animals evolved decades before Darwin put forth his theory. All existing creatures, he argued, descended from a small number of original or progenitor species.
Darwin compared the history of life to a great tree, its trunk representing these few common ancestors and an extensive system of branches and twigs symbolizing the great variety of life that has evolved from them. This evolution, Darwin wrote, is due to two factors. The first factor, Darwin argued, is that each individual animal is marked by subtle differences that distinguish it from its parents.
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