Section 16–3 The Process of Speciation (pages 404

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BIO_ALL IN1_StGd_tese_ch16
8/7/03
5:17 PM
Page 330
Name______________________________
Class __________________
Section 16–3 The Process of Speciation
Date ______________
(pages 404–410)
TEKS FOCUS: 3A Analyze hypotheses and theories; 3C Impact of research on scientific thought;
3F Contributions of scientists; 7B Results of natural selection in speciation, diversity, behavior
This section explains how species evolve and describes the process of
speciation in the Galápagos Islands.
Introduction
(page 404)
1. What is speciation? It is the formation of new species.
Isolating Mechanisms
(pages 404–405)
2. Is the following sentence true or false? Individuals in different species can have the
same gene pool.
false
3. What does it mean for two species to be reproductively isolated from each other?
Members of the two species cannot interbreed and produce fertile offspring.
4. What must happen in order for new species to evolve? Populations must be
reproductively isolated from each other.
5. List three ways that reproductive isolation occurs.
a. Behavioral isolation
c. Temporal isolation
b. Geographic isolation
6. When does behavioral isolation occur? It occurs when populations are capable of
interbreeding but have differences in courtship rituals or other types of behavior.
7. Is the following sentence true or false? Eastern and Western meadowlarks are an
true
example of behavioral isolation.
8. When does geographic isolation occur? It occurs when populations are separated by
geographic barriers such as rivers, mountains, or bodies of water.
geographic
10. Is the following sentence true or false? Geographic barriers guarantee the formation of
new species.
false
11. What is an example of temporal isolation? Each of three similar species of orchid in the
same rain forest releases pollen on different days.
Testing Natural Selection in Nature
(pages 406–407)
12. Is the following sentence true or false? The basic mechanisms of evolutionary change
cannot be observed in nature.
330
false
Guided Reading and Study Workbook/Chapter 16
© Pearson Education, Inc. All rights reserved.
9. Abert and Kaibab squirrels in the Southwest are an example of
isolation.
BIO_ALL IN1_StGd_tese_ch16
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5:17 PM
Page 331
Name______________________________
Class __________________
Date ______________
13. Circle the letter of each hypothesis about the evolution of Galápagos finches that was
tested by the Grants.
a. The finches’ beak size and shape has enough inheritable variation to provide raw
material for natural selection.
b. The different finch species are the descendants of a common mainland ancestor.
c. Differences in the finches’ beak size and shape produce differences in fitness that
cause natural selection to occur.
d. The evolution of the finches is proceeding slowly and gradually.
Speciation in Darwin’s Finches
(pages 408–410)
14. Complete the flowchart to show how speciation probably occurred in the
Galápagos finches.
Founders arrive
Separation of populations
Changes in the gene pool
Reproductive isolation
Ecological competition
© Pearson Education, Inc. All rights reserved.
Continued evolution
15. How could differences in beak size lead to reproductive isolation? Birds with the same
beak size prefer to mate with each other. As a result, big-beaked and smaller-beaked birds would
not choose to mate with each other, and their gene pools would remain isolated.
Studying Evolution Since Darwin (page 410)
16. Why is the study of evolution important? By understanding evolutionary theory, we can
respond to changes in the living world in ways that improve human life.
Guided Reading and Study Workbook/Chapter 16
331
BIO_ALL IN1_StGd_tese_ch16
8/7/03
5:17 PM
Page 332
Name______________________________
Class __________________
Date ______________
WordWise
Test your knowledge of vocabulary terms from Chapter 16 by solving the
clues. Then, copy the numbered letters in order to reveal the hidden message.
Clues
Vocabulary Terms
Type of isolation that prevents Eastern
and Western meadowlarks from
interbreeding
b
e
h
a
1
Type of selection that acts against
individuals of an intermediate type
d
v
i
o
2
i
s
r
u
s
Type of selection that causes an increase
in individuals at one end of the curve
d
p
e
i
c
i
a
3
p
5
Term that means the formation of
new species
r
a
l
4
t
i
6
7
t
i
v
e
o
n
8
9
r
e
c
t
i
o
n
a
l
a
b
i
l
i
z
i
n
g
10
Type of selection that keeps the center
of the curve at its current position
s
t
11
Kind of pool that contains all the genetic
information in a population
Type of isolation that prevents species
from interbreeding
g
r
Type of isolation that led to the evolution
of the Kaibab squirrel
g
12
e
n
e
13
14
15
e
p
r
e
o
g
o
r
d
a
u
c
p
h
t
i
16
17
i
c
v
e
b
e
18
Type of equilibrium that occurs when
allele frequencies do not change
g
e
n
e
t
i
c
19
Type of trait produced by more than
one gene
H
a
20
21
p
o
r
d
y
– W e
i
n
r
22
l
y
g
e
n
i
g
23
c
24
Hidden Message:
E
v
o
l
u
t
i
o
n
i
s
g
e
n
e
t
i
c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
c
h
a
n
g
e
19
20
21
22
23
24
332
.
Guided Reading and Study Workbook/Chapter 16
© Pearson Education, Inc. All rights reserved.
Name of the principle stating that allele
frequencies will remain constant unless
factors cause them to change

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