Study Guide for Campbell Biology
11th Edition
ISBN: 9780134443775
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece, Martha R. Taylor, Michael A. Pollock
Publisher: PEARSON
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Textbook Question
Chapter 23, Problem 12TYK
Genetic drift is likely to be seen in a population
- a. that has a low mutation rate.
- b. in which natural selection is occurring.
- c. that is very small.
- d. for which environmental conditions are changing.
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Students have asked these similar questions
Which of the following is NOT a correct statement regarding the neutral-mutation explanation for the high levels of genetic variation?
A.
Most genetic variation observed is adaptively neutral.
B.
Natural selection plays a lesser role in maintaining genetic variation.
C.
When natural selection occurs it leads to a decrease in genetic variation.
D.
Genetic variation is maintained mainly via the random effects of genetic drift.
Indicate whether each of the following statements about natural selection is true (T) or false (F). Put
either a T or an F in each box provided.
a. Natural selection alters a population's gene pool
b. Natural selection creates new alleles which increase the reproductive success of their owners
c. Natural selection favors traits which it anticipates will be beneficial to a species in the future
d. Natural selection can at times be observed in nature over the course of just a few decades
e. Natural selection acts directly on an individual's phenotype
Which of the following statements describes an example of genetic drift?a. Allele g for fat production increases in a small population because birds with more bodyfat have higher survivorship in a harsh winter.b. Random mutation increases the frequency of allele A in one population but not inanother.c. Allele R reaches a frequency of 1.0 because individuals with genotype rr are sterile.d. Allele m is lost when a virus kills all but a few individuals and just by chance, none ofthe survivors possess allele m.
Chapter 23 Solutions
Study Guide for Campbell Biology
Ch. 23 - a. What is a major source of genetic variation for...Ch. 23 - In a population of 200 mice, 98 are homozygous...Ch. 23 - Use the allele frequencies you determined in...Ch. 23 - Practice using the Hardy-Weinberg equation so that...Ch. 23 - Prob. 5IQCh. 23 - Why hasnt the highly deleterious sickle-cell...Ch. 23 - a. What is Hardy-Weinberg equilibrium? b. Define...Ch. 23 - Prob. 2SYKCh. 23 - Prob. 1TYKCh. 23 - Prob. 2TYK
Ch. 23 - Prob. 3TYKCh. 23 - Prob. 4TYKCh. 23 - Mice have an estimated 1,000 olfactory receptor...Ch. 23 - Prob. 6TYKCh. 23 - If a population has the following genotype...Ch. 23 - In a population with two alleles, B and b, the...Ch. 23 - Prob. 9TYKCh. 23 - Prob. 10TYKCh. 23 - In a random sample of a population of shorthorn...Ch. 23 - Genetic drift is likely to be seen in a population...Ch. 23 - Porphyria variegata is a genetic disease...Ch. 23 - Cystic fibrosis is a very serious genetic disorder...Ch. 23 - Prob. 15TYKCh. 23 - Prob. 16TYKCh. 23 - Prob. 17TYKCh. 23 - Prob. 18TYKCh. 23 - Prob. 19TYKCh. 23 - Prob. 20TYKCh. 23 - Prob. 21TYK
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- A. Genetic drift refers to a. change in the way the body functions as a result of stressors. b. changes in the DNA sequence, particularly in sex cells. c. random changes or accidents that reduce genetic variation in a population. B. All human cultures a. can be correlated with "races" in the past. b. are unchanging and eternal. c. can be ranked as "primitive" or "advanced". d. are integrated and complex. d. exchange of genes when outsiders migrate into an area.arrow_forwardA chance event occurs that causes a population to lose some individuals (they died); hence, a loss of alleles in the population results froma. mutation.b. migration.c. selection.d. genetic drift.arrow_forwardWhich statement is correct, based on current evolutionary theory? a. Selection will favor alleles only if they are good for the species. b. Selection will favor alleles only if, on average, they increase the reproductive success of individuals who have them. c. In small populations genetic drift can be more effective than natural selection in building adaptations. d. Selection sometimes favors alleles that systematically lower the reproductive success of the individuals who have them. e. Two of the above are correct.arrow_forward
- Which of the following is correct (can be more than 1): Genetic drift is an important mechanism of evolution: A. when the difference in fitness between alleles is small B. when a small number of individuals found a new population C. when the difference in fitness between alleles is large D. when population size is small E. when population size is large F. during and after a population bottleneckarrow_forwardIn which of the following pairs do both evolutionary processes introduce new genetic variation into a population?a. natural selection and genetic driftb. mutation and gene flowc. natural selection and gene flowd. gene flow and genetic driftarrow_forwardWhich of the following evolutionary forces can introduce new genetic variation into a population? a. natural selection and genetic drift b. mutation and gene flow c. natural selection and nonrandom mating d. mutation and genetic driftarrow_forward
- Which of the following best explains the role mutations play in natural selection?A. Most mutations are negative and result in the extinction of the entire speciesB. Mutations may appear for one or two generations, but they usually disappear quickly.C. If the environment changes, an existing organism develops a mutation that will help them to survive.D. Some mutations give individuals an advantage in their environment, allowing them to survive and reproduce.D is my answer is it correct?arrow_forwardA population of gophers is very isolated, so no individuals can move in/out of the population. It is very small, so random events affect allele frequencies and many traits are under strong selection. Males are chosen randomly. Which statement is correct? A. Allele frequencies in 10 generations will be different than they are today. B. Individual gophers are evolving traits they need to survive C.Genetic drift is not acting on the gophers D. The population is in Hardy-Weinberg equilibriumarrow_forwardWhat is meant by the following statement? "When mutation is random, natural selection is not." Mark all correct answers Group of answer choices A. A mutation is caused by changes in the environment. B. Natural selection can favor some mutations and not others. C.Mutations for advantageous traits are more likely to be passed on to the next generation. D.Selection can change depending on the environment.arrow_forward
- When taking the question, it would appear as: Consider global warming, a continual gradual increase in average temperatures. How might you expect this to affect natural selection? A.environmental changes are unpredictable, and natural selection is a random process, so it is difficult to predict outcome B.species from warmer climates are likely to expand their ranges into higher latitudes C.traits that increase reproductive success under warmer temperatures are likely to increase in frequency in a population D.the stress caused by higher temperatures will increase mutation ratesarrow_forwardWhich aspect(s) of natural selection is(are) illustrated by the figure below? Check ALL answers that apply. A. Variation among individuals must be genetically transmissible to the next generation. B. Variation must exist in a population. C. Variation among individuals leads to differences in lifetime reproductive success. D. More individuals are produced each generation than the environment can support, resulting in competition for survival.arrow_forwardWhich of the following statements about natural selection is a misconception? a.Most species don't produce more offspring than the environment can support b.Natural selection acts on heritable variations in a population c.Natural selection involves differential reproductive success d.Natural selection occurs as a result of competition among individuals in a population e.In natural selection, traits that are favoured depend on current environmental conditionsarrow_forward
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