Biology 1407- Exam 1 Questions And Answers.

Biology 1407- Exam 1 Questions And Answers. Darwin and Wallace were the first to propose ________. A. that evolution occurs. B. a mechanism for how evolution occurs. C. that Earth is older than a few thousand years. D. natural selection as the mechanism of evolution. - Correct Answer D. natural selection as the mechanism of evolution. During a study session about evolution, one of your fellow students remarks, "The giraffe stretched its neck while reaching for higher leaves; its offspring inherited longer necks as a result." Which statement is most likely to be helpful in correcting this student's misconception? A. Characteristics acquired during an organism's life are generally not passed through genes. B. Spontaneous mutations can result in the appearance of new traits. C. Only favorable adaptations have survival value. D. Disuse of an organ may lead to its eventual disappearance. - Correct Answer A. Characteristics acquired during an organism's life are generally not passed through genes. The cow Bos primigenius (which is bred for meat and milk) has a smaller brain and larger eyes than closely related wild species of ungulates. These traits most likely arose by _____. A. natural selection, because these traits evolved in the population over time. B. natural selection, because these traits were not consciously selected by humans. C. artificial selection, because changes in these traits co-occurred with human selection for high milk output and high muscle content. D. artificial selection, because these animals differ from their close relatives and common ancestor. - Correct Answer C. artificial selection, because changes in these traits co-occurred with human selection for high milk output and high muscle content. Parasitic species tend to have simple morphologies. Which of the following statements best explains this observation? A. Parasites are lower organisms, and this is why they have simple morphologies. B. Parasites do not live long enough to inherit acquired characteristics. C. Simple morphologies convey some advantage in most parasites. D. Parasites have not yet had time to progress, because they are young evolutionarily. - Correct Answer C. Simple morphologies convey some advantage in most parasites. Starting from the wild mustard Brassica oleracea, breeders have created the strains known as Brussels sprouts, broccoli, kale, and cabbage. Therefore, which of the following statements is corre