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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Chapter 23, Problem 2TYK
Summary Introduction
Introduction: Evolution is a process that introduces heritable changes in a population that passed over generation to generation by any change in frequency of an allele and change in genetic structure. Analysis of DNA by comparing the genome of different species reveals the process of evolution.
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A gene exists in two alleles, and the heterozygote has the highest fitness. This situation is likely to result in
a. directional selection. c. disruptive selection.
b. stabilizing selection. d. balancing selection.
Which of the following statements is true about linkage disequilibrium?
a.
New alleles are born into a population in LE with the surrounding loci
b.
Genetic hitchhiking results from LD between surrounding loci and a locus under strong selection
c.
Loci in LE in two different populations with different allele frequencies will remain in LE when the two populations completely merge into a single population.
d.
The greater the selection on a locus, the smaller the haplotype block maintained around it
e.
D= 0.15 indicates that two loci are in greater LD than D= -0.23
Sickle cell anemia is maintained in human populations because individuals with a single copy of the sickle cell allele have resistance to malaria but lack the health problems of individuals with two copies of the allele. Variation at the sickle cell locus is maintained by which of the following?
Group of answer choices
A. heterozygote advantage
B. random change in allele frequency
C. mutation selection balance
D. frequency dependent selection
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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- Stabilizing selection on a trait tends toa. make the trait more extreme.b. reduce variability in the trait.c. decrease the frequency of alleles associated with the trait.d. result in elaborate male ornaments.arrow_forwardWithin a particular population, darkly colored rats are more likely to survive than more lightly colored individuals. This situation is likely to result in a. directional selection. b. stabilizing selection. c. disruptive selection. d. balancing selection.arrow_forwardGenetic drift is a. a change in allele frequencies due to random fluctuations. b. likely to result in allele loss or fixation over the long run. c. more pronounced in smaller populations. d. all of the above.arrow_forward
- Which of the following statements is not an assumption of the Hardy–Weinberg law?a. The allelic frequencies (p and q) are equal.b. The population is randomly mating.c. The population is large.d. Natural selection has no effect.arrow_forwardMigration of individuals from a mainland population to a unique island population will result in… a. homogenization of allele frequencies between the two populations. b. isolation and bottleneck effect. c. increased homozygosity in both populations. d. increased population differentiation between the two populations.arrow_forwardSelection that causes one extreme phenotype to be more frequent in a population is an example ofa. disruptive selection.b. stabilizing selection.c. directional selection.d. equivalent selection.arrow_forward
- A set of alleles carried by (characteristics of) an organism that encodes for a specific trait. Select one: O a. Genetic diversity b. Karyotype c. Phenotype d. Genotype e. Natural selectionarrow_forwardWhich of the following is the MOST important characteristic of a trait for it to undergo descent with modification? A. It must be heritable. B. It must exhibit variation. C. It must exhibit phenotypic plasticity. D. Variation in the trait must be accompanied by variation in fitness.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
- Hardy Weinberg equilibrium (HWE) describes a situation in which the relative frequencies of alleles do not change over generations. which of the following could prevent HWE from being maintained? A. New mutations B. All individuals reproducing equally C. Random mating D. No individuals entering the populationarrow_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_forwardPlease provide the difference and similarites between the following and also provide explanation for each part. a. Population and gene pool b. Random mating and inbreeding c. natural selection and genetic drift. d. a polymorphic trait and a polymorphic genearrow_forward
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