Chapter 22 – The Origin of Species
Chapter 22
The Origin of Species
Fill in the Blank Questions
1. The __________ __________ model assumes that evolution occurs in spurts, between
which there are long periods of stasis with little evolutionary change.
2. The _______ definition of species says that a species is a group of organisms that are
reproductively isolated from other such groups.
3.
The phenomenon where one species diverges into many by occupying a different habitats within a region is called
__________ _________.
Chapter 22 – The Origin of Species
4. The process by which related species become more different in order to reduce competition
is called ___________ _________.
Multiple Choice Questions
5. The model that assumes that evolution proceeds with slow successive change in a given
evolutionary line is referred to as
6. The type of speciation that results in the formation of separate species as a result of
geographic isolation is called ____________ speciation.
Chapter 22 – The Origin of Species
7. When species are kept separate by preventing the formation of hybrid zygotes, the
mechanism that keeps the species separate is known as a _____________ isolating
mechanism.
8. A type of isolating mechanism that leads to reproductive isolation after a hybrid zygote has
formed is called a _____________ isolating mechanism.
9. Which isolating mechanism is postzygotic?
Chapter 22 – The Origin of Species
10. Evolution acts at the level of the
11. Hybridization regularly occurs between three species of Darwin’s finches on Daphne
Major, but the finches are still considered different species because
12.
According to the biological species concept, two groups of organisms that are unable to form fertile, viable hybrids are
considered to be different
Chapter 22 – The Origin of Species
13. In 1938, scientists found a population of coelacanths in the Indian Ocean. This fish
species is considered a “living fossil” and appears not to have changed morphologically for 80
million years. This discovery supports the ___________ model of evolution.
Chapter 22 – The Origin of Species
Clarify Question
•
What is the key concept addressed by the question?
•
What type of thinking is required?
Gather Content
•
What do you already know about punctuated equilibrium?
Choose Answer
•
Given what you now know, what information and/or problem solving approach is most
likely to produce the correct answer?
Reflect on Process
•
Did your problem-solving process lead you to the correct answer? If not, where did the
process break down or lead you astray? How can you revise your approach to produce a
more desirable result?
Chapter 22 – The Origin of Species
Check All That Apply Questions
14. Scientists observed that marine bryozoan fossils lack intermediate forms. This evidence
supports which hypotheses? Check all that apply.
Clarify Question
•
What is the key concept addressed by the question?
•
What type of thinking is required?
Gather Content
•
What do you already know about punctuated equilibrium?
Choose Answer
•
Given what you now know, what information and/or problem solving approach is most
likely to produce the correct answer?
Chapter 22 – The Origin of Species
Reflect on Process
•
Did your problem-solving process lead you to the correct answer? If not, where did the
process break down or lead you astray? How can you revise your approach to produce a
more desirable result?
Chapter 22 – The Origin of Species
Multiple Choice Questions
15. If populations within the same area split into species, the process is known as
16. If species are competing for the same resource, one species is likely to go extinct through
competitive exclusion, or natural selection will drive the evolution of
17. Scientists found that different beak shapes correlate with different mating songs in
Darwin’s finches. Which hypothesis does this support?
Chapter 22 – The Origin of Species
Clarify Question
•
What type of thinking is required?
Gather Content
•
What do you already know about reproductive isolation?
Choose Answer
•
Given what you now know, what information and/or problem solving approach is most
likely to produce the correct answer?
Chapter 22 – The Origin of Species
Reflect on Process
•
Did your problem-solving process lead you to the correct answer? If not, where did the
process break down or lead you astray? How can you revise your approach to produce a
more desirable result?
18. Once species have formed, they keep their identity by
19. Many species might coexist in a particular environment by occupying different ecological
Chapter 22 – The Origin of Species
20. Males of many marsupial species have forked penises that are incompatible with the
anatomy of female placental mammals. What type of isolating mechanism does this
represent?
Chapter 22 – The Origin of Species
Clarify Question
•
What is the key concept addressed by the question?
•
What type of thinking is required?
Gather Content
•
What do you already know about reproductive isolation?
Choose Answer
•
Given what you now know, what information and/or problem solving approach is most
likely to produce the correct answer?
Reflect on Process
•
Did your problem-solving process lead you to the correct answer? If not, where did the
process break down or lead you astray? How can you revise your approach to produce a
more desirable result?
Chapter 22 – The Origin of Species
21. Prezygotic mechanisms lead to reproductive isolation by preventing the formation of
22. In the southeastern U.S., two species of wild lettuce (Lactuca) do not usually form
hybrids, because they bloom at different seasons. The means of isolation appears to be
Chapter 22 – The Origin of Species
Clarify Question
•
What is the key concept addressed by the question?
•
What type of thinking is required?
Gather Content
•
What do you already know about reproductive isolation?
Choose Answer
•
Given what you now know, what information and/or problem solving approach is most
likely to produce the correct answer?
Reflect on Process
•
Did your problem-solving process lead you to the correct answer? If not, where did the
process break down or lead you astray? How can you revise your approach to produce a
more desirable result?
Chapter 22 – The Origin of Species
isolation, which is a prezygotic mechanism of reproductive isolation?
23. The hundreds of species of Drosophila in Hawaii exhibit different mating rituals. This
isolating mechanism is
Chapter 22 – The Origin of Species
Clarify Question
•
What is the key concept addressed by the question?
•
What type of thinking is required?
Gather Content
•
What do you already know about reproductive isolation mechanisms?
Choose Answer
•
Given what you now know, what information and/or problem solving approach is most
likely to produce the correct answer?
Reflect on Process
•
Did your problem-solving process lead you to the correct answer? If not, where did
the process break down or lead you astray? How can you revise your approach to produce a
more desirable result?
Chapter 22 – The Origin of Species
Check All That Apply Questions
24. Select all of the following that are postzygotic isolating mechanisms.
Multiple Choice Questions
25. Scientists studying a group of related bird species on an island archipelago discover that
these species are always more closely related to each other within an island than they are
between any two islands. The most likely explanation for this result is that
Chapter 22 – The Origin of Species
Clarify Question
• What is the key concept addressed by the question?
•
What type of thinking is required?
Gather Content
•
What do you already know about adaptive radiation?
Choose Answer
•
Given what you now know, what information and/or problem solving approach is most
likely to produce the correct answer?
Reflect on Process
•
Did your problem-solving process lead you to the correct answer? If not, where did the
Chapter 22 – The Origin of Species
process break down or lead you astray? How can you revise your approach to produce a
more desirable result?
26. Very rapid speciation occurred when cichlid fishes were isolated in Lake Victoria.
Widespread extinction was dramatically seen when
27. Studies of snapping shrimp on either side of the Isthmus of Panama have shown that each
Caribbean shrimp species is more closely related to a Pacific shrimp species than it is to any
other Caribbean shrimp species. The most likely explanation for this result is