A graph that shows how phenotypic frequency changed before and after selection.

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Natural selection acts on phenotypes within a population. As a result, over time, the phe-
notypic frequencies in a population can change. The graph below shows how the pheno-
type of a population changed after selection occurred.
Number of Individuals
B
Value of Phenotype
A graph that shows how phenotypic frequency changed before and after selection.
с
population
after selection
Which of the following scenarios would most likely result in the phenotypic change shown in the graph
above?
D
original
population
A
A population of rats live on the ground and in short trees. A tree-dwelling snake that
preys on the rats is introduced into the area.
Warming of the arctic tundra reduces the average snow cover that lighter-colored arctic
foxes rely on for camouflage. Darker-colored arctic foxes are better suited to the ex-
posed moss and grass habitat.
Robins that lay smaller-than-average clutches of eggs produce fewer viable offspring,
while larger-than-average clutches of eggs result in malnourished chicks that have a
higher mortality rate.
A fish that has mouth parts best adapted to eat large prey is introduced into a lake in
which there are large and small prey.
O
Transcribed Image Text:Natural selection acts on phenotypes within a population. As a result, over time, the phe- notypic frequencies in a population can change. The graph below shows how the pheno- type of a population changed after selection occurred. Number of Individuals B Value of Phenotype A graph that shows how phenotypic frequency changed before and after selection. с population after selection Which of the following scenarios would most likely result in the phenotypic change shown in the graph above? D original population A A population of rats live on the ground and in short trees. A tree-dwelling snake that preys on the rats is introduced into the area. Warming of the arctic tundra reduces the average snow cover that lighter-colored arctic foxes rely on for camouflage. Darker-colored arctic foxes are better suited to the ex- posed moss and grass habitat. Robins that lay smaller-than-average clutches of eggs produce fewer viable offspring, while larger-than-average clutches of eggs result in malnourished chicks that have a higher mortality rate. A fish that has mouth parts best adapted to eat large prey is introduced into a lake in which there are large and small prey. O
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