Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
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Chapter 19.4, Problem 1TYK
Summary Introduction
Introduction:
Directional selection: It is a mode of natural selection in which a single
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Which of the following forces can de-stabilize a population, resulting in a unstable equilibrium?
a.
short time lags in birth rates or death rates
b.
inverse density dependence
c.
density-dependent natality
d.
moderate competition
e.
density-dependent mortality
Which of the following ecological situations would result in INCREASED selection on the peaceful “dove” strategy relative to the hawk-dove game discussed in class?
Increased value of the resource
Unlikely that the individual will have future opportunities to get the resource
Decreased cost of displaying
All of the above
Under the Disturbance Selection model, r-selected individuals live in what kind of habitat?
Question 9 options:
High stress, low disturbance
Stable
Highly disturbed
Low stress, high disturbance
None of these
Chapter 19 Solutions
Principles of Biology
Ch. 19.1 - Prob. 1TYKCh. 19.1 - Prob. 2TYKCh. 19.1 - The phrase an organism evolves is incorrect....Ch. 19.1 - Prob. 1BCCh. 19.2 - Explain how geography played a key role in the...Ch. 19.2 - Prob. 2CCCh. 19.2 - Prob. 3CCCh. 19.2 - Prob. 1TYKCh. 19.2 - Homologous traits show similarities because the...Ch. 19.3 - What is the frequency of pink flowers in a...
Ch. 19.3 - Prob. 1TYKCh. 19.3 - Prob. 2TYKCh. 19.4 - Lets suppose the climate on an island abruptly...Ch. 19.4 - Prob. 2CCCh. 19.4 - Prob. 3CCCh. 19.4 - Prob. 4CCCh. 19.4 - Prob. 1TYKCh. 19.4 - Prob. 2TYKCh. 19.4 - Prob. 3TYKCh. 19.5 - How does the bottleneck effect undermine the...Ch. 19.5 - Prob. 1TYKCh. 19.5 - Prob. 2TYKCh. 19.5 - Prob. 1BCCh. 19.6 - How does migration affect the genetic compositions...Ch. 19.6 - Prob. 1BCCh. 19.6 - Prob. 1TYKCh. 19.6 - Populations that experience inbreeding may also...Ch. 19 - Prob. 1TYCh. 19 - An evolutionary change in which a population of...Ch. 19 - Homology occurs because different species occupy...Ch. 19 - Prob. 4TYCh. 19 - Prob. 5TYCh. 19 - Prob. 6TYCh. 19 - Prob. 7TYCh. 19 - Prob. 8TYCh. 19 - Prob. 9TYCh. 19 - The micro-evolutionary factor most sensitive to...Ch. 19 - Prob. 1CCQCh. 19 - Prob. 2CCQCh. 19 - A principle of biology is that populations of...Ch. 19 - Prob. 1CBQCh. 19 - Prob. 2CBQ
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- Because resources are limited, natural selection will favor organisms that acquire the most food and resources while expending the least energy, an idea called the optimal foraging theory. This theory is paired with another that more specifically explains patch movement and foraging behavior, which is named the marginal value theorem. true or falsearrow_forwardIn a population of sociable weavers (small birds that live in the African savanna), body weight was recorded for 977 birds and graphed. Identify and describe the type of selection that is occurring in the population of sociable weavers. (b) A group of fire ants from North America were accidentally brought to African savanna by an American tourist in their luggage. The fire ants bite and cause harm to all organisms and their food supply in the savanna. Explain how the fire ants will impact the ecosystem dynamics.arrow_forwardDirections: Complete the statement. This diagram demonstrates the process of __________________. It demonstrates that changes in the variation of a population can change the traits of a population. Before the introduction of the predator, each color occured in equal numbers in population. After the introduction of the predator the ____________________ variation is most common. This is because they were able to survive and ____________________ at a greater rate.arrow_forward
- Using an aggression index score, the mean aggression index (AI) of a population of honey badgers was measured as 8. The mean AI of the reproducing individuals was 3. After a generation of mating the population shows a response to selection (R) of -2 on the aggression index. What is an estimate for the proportion of phenotypic variation that is environmental?arrow_forwardIn the paper by John Endler about colored spots in guppies, Endler finds that Select one: a.female guppies become more colorful in the presence of predators. b.female guppies become less colorful in the presence of predators. c.male guppies become less colorful in the presence of predators. d.male guppies become more colorful in the presence of predators. e.No change in color occurs in both male and female guppies, providing an example of a population at Hardy-Weinberg equilibrium.arrow_forwardYou are contracted by the City of Ottawa to estimate the size of the population of small mouth bass in Dow's Lake. Using nets, you capture, mark, and release 48 bass. You return to Dow's Lake two weeks later and use the same techniques to sample more bass. This time, you capture 37 bass, 16 of which you had previously captured (marked ones). What is the estimated size of the population of small mouth bass in Dow's Lake?arrow_forward
- Which of these is the least acceptable explanation for how an altruistic gene might spread in a population? a. Selection for a gene that benefits the individuals’ relatives b. Selection for helping individuals who might return the favor c. Selection for genes that benefit the species d. Selection for groups that are more cooperative than other groupsarrow_forwardThe prey population in a grassland composed of two phenotypes, 50 brown and 50 gray. Apredator eats as many prey organisms in time available. The gray population started with 52%while the brown populatin started with 48%. As time passed by, the gray population endedwith 47% while the brown population ended with 53%.Q1. Calculate the following. Show the solution. A. Starting population(a) Gray prey(b) Brown prey B. Ending population(a) Gray prey(b) Brown preyarrow_forwardIn a mark–recapture study to estimate the size of a rodent population, researchers catch and mark 180 individuals. Two days later, they again trapped and 40% of the 100 individuals captured carried a mark from 2 days earlier. Assuming all assumptions of the mark-and-recapture methods have been met, the estimated size of the population is Group of answer choices 720 450 360 600arrow_forward
- worldwide, pest insects destroy a significant portion of food crops. for each new insecticide used, insecticides resistant insects appear and lead to the development of insecticide- resistant populations. all insecticide is a poison that kills insects describe the selective pressure ( driver of selection) in the example above and explain the reasoning for your choicearrow_forwardWhich of the following rows correctly identifies the life strategy of a population and its type of graph? Select one: a. Population Life Strategy Type of Graph Dandelions K-selected Exponential b. Population Life Strategy Type of Graph Mosquitoes K-selected Logistic c. Population Life Strategy Type of Graph Whales r-selected Logistic d. Population Life Strategy Type of Graph Rabbits r-selected Exponentialarrow_forwardFor a population to be mutualistic, the fitness of successful mutualists must be lower than unsuccessful or non-mutualists. True Falsearrow_forward
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