Human Biology: Concepts and Current Issues (8th Edition)
8th Edition
ISBN: 9780134042435
Author: Michael D. 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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Population 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 population
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.
A. When genetic drift and natural selection are combined what happens to the deleterious allele. B. What changes would be caused by population size increase
Chapter 22 Solutions
Human Biology: Concepts and Current Issues (8th Edition)
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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- a. What effect does combining genetic drift and natural selection have on beneficial mutations? b. How would you it change if population size increasesarrow_forwardPopulation genetics is the study of ________. a. how allele frequencies in a population change over time b. populations of cells in an individual c. the rate of population growth d. how genes affect embryological developmentarrow_forwardGalápagos 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_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_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_forwardGenetic drift a.) All of the answers are correct b.) Reduces genetic variation within a population c.) None of the answers are correct d.) Can lead to divergence between populations. e.) Will always lead to higher fitness of individuals in the populationarrow_forward
- 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 populationsarrow_forwardWhich of the following accurately describes human genetic variation relative to the amount of variation found in other species? Group of answer choices A. low and mostly occurs within populations B. high and mostly occurs between populations C. non-existent, humans are all clones D. high and mostly occurs within populations E. low and mostly occurs between populationsarrow_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_forward
- a.)What effect does directional selection have on genetic variation? b.)A population has an allele that encodes for ear size, large ear being dominant and small ear being recessive. The frequency of the dominant allele is .6. What percentage of the population has big ears?arrow_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_forwardHigh values for heterozygosity (or expected heterozygosity) at a genetic locus in a population indicates that there is: a. A lot of genetic variation b. Little genetic variation c. A population not under HW equilibrium d. A large amount of homozygosityarrow_forward
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