Our Origins: Discovering Physical Anthropology (Fourth Edition)
4th Edition
ISBN: 9780393614008
Author: Clark Spencer Larsen
Publisher: W. W. Norton & Company
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Chapter 4, Problem 2SQ
Summary Introduction
Introduction: The evolution is the process by which the heritable characteristics of an organism change over successive generations. It is often results in new species development. These heritable characteristics are the expressions of genes that passed during reproduction from parent to offspring.
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The“mean generation time” of a population equals:a.(x lxmx)/R0.b.nx.c.lx mx.d.x lx mx.e.none of the choices apply.
If predicted genotypic frequencies do not match actual genotypic frequencies, what is true of the population?
a
It is changing.
b
It is in equilibrium.
c
The frequencies are unpredictable.
d
The sample population was too large.
Which of the following is/are assumptions made under the Hardy-Weinberg equilibrium principle?
A. Mutations are introduced into the gene pool at a regular frequency.
B. New alleles may be introduced to the population by migration.
C. Gametes combine at random.
D. The fittest individuals in a population are most likely to reproduce.
E. Allele frequencies change at random from one generation to the next.
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Our Origins: Discovering Physical Anthropology (Fourth Edition)
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- The Hardy-Weinberg equation characterizes the allele and genotypefrequenciesa. of a population that is experiencing selection for mating success.b. of a population that is extremely small.c. of a population that is very large and not evolving.d. of a community of species that is not evolving.e. of a community of species that is experiencing selection.arrow_forwardPopulations are evolving if A. the Hardy-Weinberg equation equals 1. B. the Hardy-Weinberg equation equals 0. C. p + q changes between generations. D. p + q remains the same between generations.arrow_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_forward
- Which of the following is NOT an example of an r-selected population? Select one: a. Mosquito lifespan is between 42 and 56 days for females and 10 days for males. b. Minnows spawn 16 to 26 times per year, yielding up to 10 000 eggs per female. c. Houseflies are very tolerant of a wide range of environmental conditions and thus have a broad range of habitat. d. Algae are capable of reproducing asexually and sexually to take advantage on the conditions of the environment.arrow_forwardWhich of the following would not be an example of density-deperident factors regulating population size? The number of possible territories for robins is limited; thus when population sizes are high, a lower proportion of individuals can produce offspring. A. O B. In conditions of overcrowding, some desert pupfish living in ponds will emigrate to other ponds if given the opportunity. C.Predation on mosquitofish is high, regardless of population size. D. In conditions of high density, mice are more susceptible to mortality from heat stress. E. In a habitat patch with a high density of muskrats, a disease spreads more rapidly and results in higher mortality.arrow_forwardA population has 1000 juvenile individuals, 100 young adult individuals, and 10 older adult individuals. This population is likely…? Group of answer choices a, increasing b. decreasing c. stable d. no way to tellarrow_forward
- Assuming a population is in Hardy-Weinberg equilibrium, an increase in the frequency of the p(A) allele from 0.6 to 0.9 would result in which of the following outcomes? a. A decrease in the number of homozygous dominant individuals within the population b. A decrease in the number of homozygous recessive individuals within the population c. An increase in the number of homozygous recessive individuals within the population d. An increase in the number of heterozygotes within the population e. No change in genotypic frequency within the populationarrow_forwardGotelli discusses how environmental stochasticity influences extinction, arguing that a scaling relationship between the mean and variance of population growth rate (r) determine extinction risk. What is the scaling relationship? О а. Environmental stochasticity doesn't influence extinction risk b. Extinction will occur if the variance in r is double the mean С. Extinction will occur if the variance in r is greater than the mean squared d. Extinction will occur if the variance in r is greater than the mean е. Extinction will occur if the variance in r goes to 0arrow_forwardWhat condition(s) is/are necessary for the development of both antagonistic and mutualistic coevolutionary relationships?A. Intimate pairwise interactions with one or more species.B. The agents of selection that are relevant to the populations must evolve.C. Frequency-dependent selection.D. All of the above are necessary for the development of coevolutionary relationships.arrow_forward
- Suppose that in a population the frequency of a particular recessive condition is 1/400. Assume this is locus with two alleles (A and a) in the population and that the population is at Hardy–Weinberg equilibrium. What is the frequency of the carriers of this condition in the population? A. 0.9025 B. 0.0025 C. 0.05 D. 0.095 E. 0.0475arrow_forwardFigure (c) shows a population increasing in size under the influence of the relationships in (a) and (b). What do each arrow represent?arrow_forwardExplain why you agree or disagree with the followingpropositions:a. Stabilizing population is not desirable because, without more consumers, economic growth would stop.b. The world will never run out of resources becausewe can use technology to find substitutes and tohelp us reduce resource waste.c. We can shrink our ecological footprints while creating beneficial environmental impacts.arrow_forward
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