Biology

Peter H. Raven, George B. Johnson, Kenneth A. Mason

Chapter 22

The Origin of Species - all with Video Answers

Educators

RS

Chapter Questions

Problem 1

Prezygotic isolating mechanisms include all of the following except.
a. hybrid sterility.
b. courtship rituals.
c. habitat separation.
d. seasonal reproduction.

Rashmi Sinha

Rashmi Sinha

Numerade Educator

Problem 2

Reproductive isolation is
a. a result of individuals not mating with each other.
b. a specific type of postzygotic isolating mechanism.
c. $\quad$ required by the biological species concept.
d. $\quad$ None of the choices is correct.

Leah Lampen

Numerade Educator

Problem 3

Problems with the biological species concept include the fact that
a. many species reproduce asexually.
b. postzygotic isolating mechanisms decrease hybrid viability.
c. prezygotic isolating mechanisms are extremely rare.

Leah Lampen

Numerade Educator

Problem 4

Allopatric speciation
a. $\quad$ is less common than sympatric speciation.
b. involves geographic isolation of some kind.
c. is the only kind of speciation that occurs in plants.
d. requires polyploidy.

Leah Lampen

Numerade Educator

Problem 5

Gradualism and punctuated equilibrium are
a. two ends of the continuum of the rate of evolutionary change over time.
b. mutually exclusive views about how all evolutionary change takes place.
c. mechanisms of reproductive isolation.
d. None of the choices is correct.

Leah Lampen

Numerade Educator

Problem 6

Prezygotic isolation
a. always involves mechanisms that prevent interbreeding of members of different species.
b. includes the death of a zygote shortly after fertilization.
c. only occurs in plants.
d. $\quad$ becomes stronger as the result of reinforcement.

Leah Lampen

Numerade Educator

Problem 7

Speciation by allopolyploidy
a. takes a long time.
b. $\quad$ is common in birds.
c. $\quad$ leads to reduced numbers of chromosomes.
d. occurs after hybridization between two species.

Leah Lampen

Numerade Educator

Problem 8

Adaptive radiation
a. is the result of enriched uranium used in power plants.
b. is the evolution of closely related species adapted to use different parts of the environment.
c. results from genetic drift.
d. is the outcome of stabilizing selection favoring the maintenance of adaptive traits.

RS

Rajpal Sian

Numerade Educator

Problem 9

Leopard frogs from different geographic populations of the Rana pipiens complex
a. are members of a single species because they look very similar to one another.
b. are different species shown to have pre and postzygotic isolating mechanisms.
c. $\quad$ frequently interbreed to produce viable hybrids.
d. $\quad$ are genetically identical due to effective reproductive isolation.

Leah Lampen

Numerade Educator

Problem 10

Character displacement
a. arises through competition and natural selection, favoring divergence in resource use.
b. $\quad$ arises through competition and natural selection, favoring convergence in resource use.
c. does not promote speciation.
d. $\quad$ reduced speciation rates in Galápagos finches.

Leah Lampen

Numerade Educator

Problem 11

During the history of life on Earth
a. there have been major extinction events.
b. species diversity has steadily increased.
c. species diversity has stayed relatively constant.
d. extinction rates have been completely offset by speciation rates.

Leah Lampen

Numerade Educator