Biology
12th Edition
ISBN: 9780134813448
Author: Audesirk, Teresa, Gerald, Byers, Bruce E.
Publisher: Pearson,
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Textbook Question
Chapter 16, Problem 5MC
Genetic drift occurs
- a. when different
phenotypes have different reproductive success. - b. in small populations but not in large populations.
- c. when only a random subset of a population reproduces.
- d. in mammals but not in bacteria.
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Students have asked these similar questions
This model shows the process of natural selection on rabbits demonstrating variation in fur color over several generations. Using the model, what most likely led to the loss of white furred rabbits in the population?
A) the white rabbits did not reproduce fast enough to survive
B) white was a recessive trait and therefore not passed on to any offspring
C) the white fur was a favorable trait but was never prevalent in the population
D) the rabbits with white fur had less camouflage in the environment and were more easily preyed on by predators
Genetic drift can be defined as
Group of answer choices
A. accidental changes in DNA structure
b.how lazy loci evolve
c. random change in allele frequency over time
D. differences in fitness between alleles
a. What effect does combining genetic drift and natural selection have on beneficial mutations? b. How would you it change if population size increases
Chapter 16 Solutions
Biology
Ch. 16.1 - define evolution in terms of concepts from...Ch. 16.1 - define equilibrium population and describe the...Ch. 16.2 - If it were true that mutations do occur in...Ch. 16.2 - Explain how the distribution of genotypes in...Ch. 16.2 - A flu vaccination stimulates your immune system to...Ch. 16.2 - Prob. 3TCCh. 16.2 - If a population grows large again after a...Ch. 16.2 - Prob. 5TCCh. 16.2 - Evolution of a Menace The mutant alleles that...Ch. 16.2 - describe how mutation, gene flow, genetic drift,...
Ch. 16.3 - A team of phys clans treated four patients with...Ch. 16.3 - If we studied a population of bighorn sheep and...Ch. 16.3 - When selection is directional, is there any limit...Ch. 16.3 - describe why selection of phenotypes can affect...Ch. 16.3 - explain how competition and predation influence...Ch. 16.3 - Prob. 3CYLCh. 16.3 - compare and contrast directional selection,...Ch. 16.3 - Microbiologists have discovered that alleles...Ch. 16 - The alleles responsible for antibiotic resistance...Ch. 16 - Stabilizing selection on a trait tends to a. make...Ch. 16 - An adaptation is a. any trait that arises from a...Ch. 16 - Which of the following statements about mutations...Ch. 16 - Genetic drift occurs a. when different phenotypes...Ch. 16 - The ______ provides a simple mathematical model...Ch. 16 - Different versions of the same gene are called...Ch. 16 - An organisms ______ refers to the specific alleles...Ch. 16 - A random form of evolution is called ________....Ch. 16 - Competition is most Intense between members of...Ch. 16 - The evolutionary fitness of an organism is...Ch. 16 - What is a gene pool? How would you determine the...Ch. 16 - Define equilibrium population. Outline the...Ch. 16 - How does population size affect the likelihood of...Ch. 16 - If you measured the allele frequencies of a gene...Ch. 16 - People like to say that you cant prove a negative....Ch. 16 - Describe the three ways in which natural selection...Ch. 16 - What is sexual selection? How is sexual selection...Ch. 16 - In North America, the average height of adult...Ch. 16 - By the 1940s, the whooping crane population had...
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- Which evolutionary forces a. cause an increase in genetic variation both within and between populations? b. cause a decrease in genetic variation both within and between populations? c. cause an increase in genetic variation within populations but cause a decrease in genetic variation between populations?arrow_forwardChoose one sentence that best describes a consequence of genetic drift a. Alleles in small populations are less likely to become fixed than those in large populations b. Large populations tend to lose genetic diversity faster than small populations c. New mutations are equally frequent in large and small populations d. Small populations tend to lose genetic diversity faster than large populationsarrow_forwardHow is genetic drift like natural selection? A. They both depend upon the founder effect B. Both usually bring about adaptation to the environment C. They both cause gene frequency changes D. All of these are correct Mutations are __________. A. The sole source of variation in a sexually reproducing organisms B. The ultimate source of variation in sexually reproducing organisms C. Both genetic and chromosomal in nature D. All of these are correctarrow_forward
- Which of the following conclusions are MOST likely to be supported by genetic evidence? A. Some modern-day organisms did not exist in the past. B. Some organisms found in the fossil record do not currently exist. C. Environmental change affected the fitness of individuals differently based on their traits. D. Some disease-causing traits may remain in a population because their alleles provide an advantage to heterozygotes.arrow_forwardYou are studying a species of beetle known as a Flumbodoodle Beetle. The beetle has long spikes on its shell to defend itself from potential predators. You are interested in studying evolution in this beetle. Which of the following studies do you not need to conduct to determine if the long spike trait can evolve by natural selection. a. A study that determines whether beetles with longer spikes survive and reproduce better than beetles with shorter spikes. b. A study that measures the spike length variation across multiple individuals in a population. c. A study where you measure the spike length on the parents and a study where you measure the spike length on the offspring. d. A study that determines whether these spikes on the beetle are also used in mate choice contexts.arrow_forwardWhat is the difference between artificial selection (e.g., greyhounds that are bred for speed) and natural selection? a. In artificial selection, the genetic variation introduced into the population is limited, but in natural selection, it is not b. In artificial selection, the environment is the selective force, while in natural selection, humans are the selective force c. In natural selection, the environment is the selective force, while in artificial selection, humans are the selective force d. Unlike other species, dogs are not subject to natural selection e. Both A & Carrow_forward
- Darwin based his Theory of Evolution by Natural Selection on series of observations. Which of the following is not associated with his theory? a) individuals in a population vary phenotypically b) organisms tend to under-reproduce themselves c) there are limited resources for which individuals compete d) some variations possessed by individuals of a population are inheritedarrow_forwardDistinguish genetic drift from gene flow in terms of(a) how they occur and (b) their implications for futuregenetic variation in a population.arrow_forwardWhich 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.arrow_forward
- With stronger natural selection, was the more beneficial allele lost from these small populations?a) It was lost very frequently, and the strength of natural selection did not make any difference.b) It was never lost.c) It was lost a few times, but not very often, and it was lost less frequently under strong selection.d) It was lost a few times, and it was lost more frequently under strong selection.arrow_forwardWhich statement best summarizes why genetic drift tends to impact small populations more than large populations? A. Small populations have a heterozygote advantage because heterozygotes are more common than homozygotes. B. Small populations have a smaller gene pool, so random changes influence them more. C. Small populations have a relatively large gene pool, so the founder effect stabilizes their alleles.D. Small populations tend to experience directional selection, making one phenotype more common.arrow_forwardIn which of the following pairs do both evolutionary processes introduce new genetic variation into a population? a. natural selection and genetic drift b. mutation and gene flow c. natural selection and gene flow d. gene flow and genetic driftarrow_forward
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