Biology: The Unity and Diversity of Life (MindTap Course List)
14th Edition
ISBN: 9781305073951
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Chapter 17, Problem 1DAA
Summary Introduction
To determine: The town with most of the rats susceptible to warfarin.
Introduction: Rodenticides are the pesticides that have a capability to kill the whole rodent species. Rodents have their own importance in nature but sometimes require some control over their population, as they could transmit disease, destroy crops, and may cause ecological damage. Warfarin is a common anticoagulant that could be used as a rodenticide to kill mice and rats. After the discovery, warfarin has been widely used and later it resulted in the development of species of warfarin-resistant mice and rats.
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Each graph below depicts reaction norms for three different genotypes reared in different
environments. In which case(s) is/are VE> 0 (you can assume that graphs for parents and
their offspring would be the same)? Mark all that apply
Mean phenotype
(a)
(c)
graph a
graph b
graph c
graph d
(b)
(d)
Environment
The pesticide DDT was widely used in the 1940s as a method of insect control. In the late 1950s the first DDT-resistant mosquitoes were discovered, and eventually DDT-resistant mosquitoes were found globally. When DDT is used now, the development of DDT resistance in mosquito populations occurs in months rather than years.Which of the following best explains the observations concerning DDT resistance in mosquitoes?
a) The proportion of DDT-resistant mosquitoes in a population remains constant due to the metabolic costs of DDT utilization
b) Natural selection favors DDT-resistant mosquitoes that are already present in a population when DDT exposure occurs.
c) DDT is a chemical signal that delays normal reproductive cycles in many mosquito populations.
d) Competition for limited resources causes mosquitoes to migrate to geographical areas that have richer supplies of DDT.
It was later discovered in Cliff Tabin’s lab that a gene called Bmp4 involved in cell-cell signaling during beak development is partly responsible for beak depth in ground finches (Abzhanov et al., 2004). Alleles that increase Bmp4 expression increase the depth of the beaks, and were most likely selected for during the drought in 1977 (Abzhanov et al., 2004). In 2001, ground finches were collected from Daphne major and genotypes were analyzed at this particular locus.
Phenotype
Genotype
Number of Individuals
Observed Genotype Frequency
Low Bmp4 expression
AA
491
?
Low Bmp4 expression
Aa
336
?
High Bmp4 expression
aa
552
?
In 2009, allele frequencies were measured again on Daphne major for this particular gene.
Phenotype
Genotype
Number of Individuals
Observed Genotype Frequency
Low Bmp4 expression
AA
706
?
Low Bmp4 expression
Aa
493
?
High Bmp4 expression…
Chapter 17 Solutions
Biology: The Unity and Diversity of Life (MindTap Course List)
Ch. 17 - ___ is the original source of new alleles. a....Ch. 17 - Which is required for evolution to occur in a...Ch. 17 - Prob. 3SQCh. 17 - Prob. 4SQCh. 17 - The persistence of sickle-cell anemia in a...Ch. 17 - ___ tends to keep populations of a species similar...Ch. 17 - The theory of natural selection does not explain...Ch. 17 - Prob. 1DAACh. 17 - Prob. 2DAACh. 17 - Prob. 3DAA
Ch. 17 - Prob. 4DAACh. 17 - Which of the following is not part of how we...Ch. 17 - Sex in many birds is typically preceded by an...Ch. 17 - The difference between sympatric and parapatric...Ch. 17 - A fire devastates all trees in a wide swath of...Ch. 17 - Match the evolution concepts. ____ gene flow a....Ch. 17 - Change in allele frequency of a population is...Ch. 17 - Species have traditionally been characterized as...Ch. 17 - Rama the cama, a llama-camel hybrid, was born in...Ch. 17 - Two species or antelope, one from Africa, the...Ch. 17 - Prob. 4CT
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