Campbell Biology in Focus (2nd Edition)
2nd Edition
ISBN: 9780321962751
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece
Publisher: PEARSON
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Textbook Question
Chapter 20.1, Problem 1CC
Which levels of the classification in Figure 20.3 do humans share with leopards?
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What behavioral trait(s) prevents interbreeding between different finch species?
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Results of a study on local adaptation of color patterns in snakes show the
frequency of different color patterns of water snakes of Lake Erie (Nerodia sipedon)
found on the mainland shores and scattered islands within the lake. Type A snakes
are unbanded, Type D is strongly banded, and Types B and C are intermediates.
Given that natural selection favors unbanded snakes on the islands, how can you
account for the presence/perpetuation of banded snakes on the islands?
100
Percentage
80 N=63
60
40
20
0
ABCD
Ontario
mainland
N=64
A B C D
Peninsular
mainland
N=16
ABCD
Kelleys Island
N= 214
A B C D
Bass complex
islands
N=188
L
ABCD
Middle and Pelee
islands
O Natural selection favors unbanded snakes on the mainland.
O Snakes on the islands represent a case of the so-called founder effect.
O Natural selection favors banded snakes on the mainland, which occasionally migrate to the
islands.
O Mutation rates converting unbanded alleles to a banded form operate at high frequencies
on islands.
Chapter 20 Solutions
Campbell Biology in Focus (2nd Edition)
Ch. 20.1 - Which levels of the classification in Figure 20.3...Ch. 20.1 - Which of the trees shown here depicts an...Ch. 20.1 - Prob. 3CCCh. 20.2 - Decide whether each of the following pairs of...Ch. 20.2 - WHAT IF? Suppose that two species, A and B, have...Ch. 20.3 - Prob. 1CCCh. 20.3 - The most parsimonious tree of evolutionary...Ch. 20.3 - WHAT IF? Draw a phylogenetic tree that includes...Ch. 20.4 - What is a molecular clock? What assumption...Ch. 20.4 - MAKE CONNECTIONS Review Concept 14.5. Then...
Ch. 20.4 - WHAT IF? Suppose a molecular clock dates the...Ch. 20.5 - Why is the kingdom Monera no longer considered a...Ch. 20.5 - Prob. 2CCCh. 20.5 - Prob. 3CCCh. 20 - In a comparison of birds and mammals, the...Ch. 20 - To apply parsimony to constructing a phylogenetic...Ch. 20 - Prob. 4TYUCh. 20 - Prob. 5TYUCh. 20 - If you were using cladistics to build a...Ch. 20 - Prob. 7TYUCh. 20 - SCIENTIFIC INQUIRY DRAW IT (a) Draw a phylogenetic...Ch. 20 - FOCUS ON EVOLUTION Darwin suggested looking at a...Ch. 20 - Prob. 10TYUCh. 20 - SYNTHESIZE YOUR KNOWLEDGE This West Indian manatee...
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- Peter Boag, studied the inheritance of beak depth in Galapagos finches by looking at the relationship between parent beak depth (in mm) and that of their offspring. He collected two sets of parent offspring data, once in 1976 and again in 1978. For both years he followed birds to determine which pairs belonged to which nests. Most of the parents had been previously captured so their beak depths were known. He then captured the offspring when they fledged and measured their beak depth. He calculated the "midparent" beak depth (the average beak depth of the two parents) and then compared that to beak depth of their offspring. Here is what he found in 1976: Assume that in 1978, all the finches with beak depths less than 9.0 mm died due to prolonged drought. Use your knowledge of how quantitative traits respond to selection and the following relationship, R = h2S, to determine the following: Selection differential. Predicted response…arrow_forwardWhich node, 1-8, represents the most recent common ancestor of the Gray Wolf and the Domestic dog? Which node represents the most recent common ancestor of the Domestic Dog and the Red Fox? Which node represents the most recent common ancestor of the Coyote and the Swift Fox? Which node represents the most recent common ancestor of the Maned wolf and the Gray wolf?arrow_forwardExplain Measuring the heritability of bill depth in populations of Darwin’s finches?arrow_forward
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