Human Biology : Concepts and Current Issues - With Access
7th Edition
ISBN: 9780321874856
Author: Johnson
Publisher: PEARSON
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Textbook Question
Chapter 22, Problem 8TY
Genetic drift is most likely to affect:
a. every population, regardless of
b. small populations
c. large populations
d. large and diverse communities
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a. What effect does combining genetic drift and natural selection have on beneficial mutations? b. How would you it change if population size increases
Choose 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 populations
With regard to genetic drift, are the following statements true or false? If a statement is false, explain why.
A. Over the long run, genetic drift leads to allele fixation or loss.
B. When a new mutation occurs within a population, genetic drift is more likely to cause the loss of the new allele rather than the fixation of the new allele.
C. Genetic drift promotes genetic diversity in large populations.
D. Genetic drift is more significant in small populations.
Chapter 22 Solutions
Human Biology : Concepts and Current Issues - With Access
Ch. 22 - Do you think the skeletons of Liang Bua Cave...Ch. 22 - Is it important that we try to discover the...Ch. 22 - Describe the three key elements of evolution.Ch. 22 - Explain how a fossil is created.Ch. 22 - List some of the main sources of evidence for...Ch. 22 - Prob. 4CRCh. 22 - Prob. 5CRCh. 22 - Prob. 6CRCh. 22 - Explain how rising atmospheric concentrations of...Ch. 22 - List the features that make Hominidae different...
Ch. 22 -
9. Describe the origins of Homo sapiens.
Ch. 22 - Explain why racial differences may disappear...Ch. 22 - Prob. 1TYCh. 22 - Prob. 2TYCh. 22 - Prob. 3TYCh. 22 - Vestigial structures, homologous structures, and...Ch. 22 -
5. Which of the following statements about...Ch. 22 - Which of the following best describes evolutionary...Ch. 22 - Prob. 7TYCh. 22 - Genetic drift is most likely to affect: a. every...Ch. 22 -
9. Which of the following would be described as...Ch. 22 - Which of the following statements is true? a. Mass...Ch. 22 - In what order did events occur that led to life on...Ch. 22 - Prob. 12TYCh. 22 -
13. Which of the following statements about the...Ch. 22 - Prob. 14TYCh. 22 - Which of the following is not believed to be a...Ch. 22 - Prob. 1AWKCh. 22 - Prob. 2AWKCh. 22 - Critics of evolution often charge, correctly as it...Ch. 22 - Prob. 4AWKCh. 22 - Prob. 5AWKCh. 22 - It is believed that humans evolved in Africa and...Ch. 22 - Prob. 7AWKCh. 22 - Of all the great evolutionary advances of life on...
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- Which 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_forwardPopulation genetics is the study of: a. how selective forces change the allele frequencies in a population over time b. the genetic basis of population-wide traits c. whether traits have a genetic basis d. the degree of inbreeding in a populationarrow_forwardWhich of the following is an example of genetic drift? Group of answer choices A-As global temperatures increase, alleles that confer resistance to heat become more prevalent B-Peter Parker gets irradiated and turns into Spider Man C-The American Bison was hunted almost to extinction very quickly, and only a few remained D-5% of your neighborhood moves to Canadarrow_forward
- Which 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_forwardGenetic 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 allelesarrow_forwardThere is a population of cats and 16% of the cats this population show a recessive trait. a. What is the frequency of the recessive allele? b. What is the frequency of the dominant genotype? c. What is the frequency of cats with the heterozygous genotype?arrow_forward
- Which of the following statements most accurately describes the effects of genetic drift on a population? a. Populations of the same size will follow the same evolutionary trajectory when evolving due to drift. b. Genetic drift has the potential to drive evolution in all populations. c. Allele frequencies in a population of infinite size will ultimately drift to fixation or loss. d. The loss of otters in California due to excessive hunting cause a founder effect.arrow_forwardA. When genetic drift and natural selection are combined what happens to the deleterious allele. B. What changes would be caused by population size increasearrow_forwardWhich of the following influences on genetic drift involve the migration of a population from one location to another? a. The bottleneck effect b. The founder effect c. Both a and b d. None of the abovearrow_forward
- When male lions reach sexual maturity, they leave their group in search of a new pride. This can alter the allele frequencies of the population through which of the following mechanisms? a. natural selection b. genetic drift c. gene flow d. random matingarrow_forwardGalapagos medium ground finches are found on Santa Cruz and San Cristóbal islands, which are separated by about 100 km of ocean. Occasionally, individuals from either island fly to the other island to stay. This can alter the allele frequencies of the population through which of the following mechanisms? a. natural selection b. genetic drift c. gene flow d. mutationarrow_forwardThe continued presence of the allele that causes sickle cell anemia in areas where falciparum malaria is prevalent demonstrates which of the following phenomena? (a) inbreeding depression (b) frequency-dependent selection (c) heterozygote advantage (d) genetic drift (e) a genetic bottleneckarrow_forward
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