{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Term Test 1 2006 - Term Test 1 page 1 of 8 1 A key point in...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Term Test 1 page 1 of 8 1. A key point in Darwin’s explanation of evolution is that the biological structures most likely inherited are those that have become better suited to the environment because a. extinction is nature’s way of weeding out undeserving organisms. b. genes change in order to help organisms cope with problems encountered within their environments. c. mutations that occur are those that will help future generations fit into their environments. d. slight variations among individuals significantly affect the chance that a given individual will survive in its environment and be able to reproduce. 2. Over time, mutations are important to evolution because a. Mutations are usually beneficial to offspring. b. Whether good or bad, mutations increase the fitness of an individual. c. Most mutation rates are about 1 in 10 6 - 10 9 cell divisions. d. Mutations are the original source of variation. e. Once an allele is changed through mutation, another mutation to that same allele cannot happen. 3. Selection acts on ________ variation; however, evolution depends on ______ variation in the population. a. phenotypic; genetic b. genetic; phenotypic c. genetic; environmentally-induced d. environmentally-induced; phenotypic e. environmentally-induced; genetic 4. Consider the example of sickle-cell anemia discussed in lecture and your text. Which of the following can be concluded from this example? 5. Evolution by natural selection is a powerful force of change. What keeps organisms from becoming perfectly adapted to their environment? 6. Which of the following processes is not the result of chance, random events? BIO152H5F Term Test 1 2006
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Term Test 1 page 2 of 8 Read this passage for the following 3 questions BIOLOGICAL EVOLUTION What exactly do biologists mean when they say that they have observed evolution or that humans and chimps have evolved from a common ancestor? One of the most respected evolutionary biologists has defined biological evolution as follows: “In the broadest sense, evolution is merely change, and so is all-pervasive; galaxies, languages, and political systems all evolve. Biological evolution is change in the properties of organisms that transcend the lifetime of a single individual. The developmental changes of an individual are not considered evolution; individuals do not evolve.
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern