Campbell Biology in Focus (2nd Edition)
2nd Edition
ISBN: 9780321962751
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 21.3, Problem 2CC
Distinguish genetic drift from gene flow in terms of (a) how they occur and (b) their implications for future
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Explain genetic drift (and it’s various types) as a force of evolution (how does genetic drift contribute to biological change?)
Define genetic drift and give three ways in which it can arise. Whateffect does genetic drift have on a population?
Three basic predictions underlie genetic drift in populations: (1) As long as the population size is finite,some level of genetic drift will occur; thus, withoutnew mutations, all variation will drift either to fixationor to loss. (2) Drift happens faster in small populationsthan in large populations. (3) The probability that anallele is fixed (goes to a frequency of 1.0) is equal toits initial frequency (p) in the population, while itsprobability of loss from the population due to drift isequal to 1 − p. Given these three predictions:a. What is the allele frequency of a new autosomalmutation immediately after it occurs in a diploidpopulation of size N = 100,000?b. What is the allele frequency of a new autosomalmutation immediately after it occurs in a diploidpopulation of size N = 10?c. In which population does the new mutation have ahigher probability of going to fixation by chancewith genetic drift?
Chapter 21 Solutions
Campbell Biology in Focus (2nd Edition)
Ch. 21.1 - Explain why genetic variation within a population...Ch. 21.1 - Of all the mutations that occur in a population,...Ch. 21.1 - Prob. 3CCCh. 21.2 - A population has 700 individuals, 85 of genotype...Ch. 21.2 - The frequency of allele a is 0.45 for a population...Ch. 21.2 - WHAT IF? A locus that affects susceptibility to a...Ch. 21.3 - In what sense is natural selection more...Ch. 21.3 - Distinguish genetic drift from gene flow in terms...Ch. 21.3 - WHAT IF? Suppose two plant populations exchange...Ch. 21.4 - What is the relative fitness of a sterile mule?...
Ch. 21.4 - Explain why natural selection is the only...Ch. 21.4 - Prob. 3CCCh. 21 - Natural selection changes allele frequencies...Ch. 21 - No two people are genetically identical, except...Ch. 21 - Sparrows With average-sized w1ngs survive severe...Ch. 21 - If the nucleotide variability of a locus equals...Ch. 21 - There are 25 individuals in population 1, all with...Ch. 21 - A fruit fly population has a gene with two...Ch. 21 - FOCUS ON EVOLUTION Using at least TWO examples,...Ch. 21 - Prob. 9TYUCh. 21 - SYNTHESIZE YOUR KNOWLEDGE This kettle lake formed...
Additional Science Textbook Solutions
Find more solutions based on key concepts
Match the people in column A to their contribution toward the advancement of microbiology, in column B. Column ...
Microbiology: An Introduction
True or false? Some trails are considered vestigial because they existed long ago.
Biological Science
How does trandlation differ from transcription?
Microbiology: Principles and Explorations
Describe the role and impact of microbes on the earth.
Microbiology Fundamentals: A Clinical Approach - Standalone book
Define histology.
Fundamentals of Anatomy & Physiology Plus Mastering A&P with eText - Access Card Package (10th Edition) (New A&P Titles by Ric Martini and Judi Nath)
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- In 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_forwardThe evolution of a qualitative trait in reponse to natural selection is described by the following equation, R=h2 S a) What is h2 and what does it measure? b) Describe a study that would allow you to estimate h2 for a real populationarrow_forward5. a. Is genetic drift a gain or loss in heterozygosity? b. What population is most effected by drift? Ne = 20 or Ne = 200. Why? c. There is a balancing act between drift and another force of evolution. What is it and why is this important?arrow_forward
- Explain the role of genetic drift in shaping the genetic landscape of populations. Compare and contrast genetic drift with other evolutionary forces, such as natural selection, highlighting their respective contributions to population genetic variation.arrow_forwardDefine genetic drift and how does it contribute to the evolution of a population?arrow_forward1. List three places outside of Africa where sickle-cell anemia is fairly common in the indigenous population: a. b. c. 2. Why hasn't the sickle-cell trait died out? 3. What is the ultimate source of biological variation? What is the difference between gene flow and genetic drift?arrow_forward
- Let’s say that a large ancestral population of really cool organisms is subdivided, by a geological cataclysm, into a large number of isolated, ideal populations, each of size 100. Suppose we’re interested in an autosomal locus with two alleles, A and a, with p = the frequency of A = 0.75 in the ancestral population, as well as in each newly isolated population. Assume that genetic drift is the only evolutionary force operating. a) What is the average allele frequency of A in the populations after 5, 10, and 100 generations? b) What allele frequencies of A do you expect to find within each population at equilibrium, and what percentage of the populations will have each specific allele frequency? (recall various simulations we did/could do of genetic drift in several populations) c) What is the average Inbreeding Coefficient (or Fixation Index) F for each population after 20 generations? Assume F = 0 for all individuals in the ancestral population. d) Redo (c), assuming an initial…arrow_forwardWhat is the difference between selection and genetic drift andhow do they promote evolutionary change?arrow_forwardWhy is population level genetic variation important for evolution and what causes genetic variation ? How do we detect if evolution is occurring ?arrow_forward
- Considering the principles of mutation , natural selection , and genetic drift do you expect evolution by natural selection to occur more rapidly in small or large populations ? What about evolution by genetic drift For each answer please explain your reasoning with detail or an example .arrow_forwardAlthough individuals are selected for or against bynatural selection, it is populations that actually evolve.The application of genetics in the theory of naturalselection has been the most important post-Darwinianadvancement in evolutionary biology. a. Explain why genetic variation within apopulation is a prerequisite for evolution. b. State and explain the factors that producegenetic variation among populations.arrow_forwardThere are five generations of complete selection against recessive individuals (a) , migration (b), and random genetic drift (c). that affect the gene (A, a) and genotypic (AA, Aa, aa) frequencies of the population. Afterward, answer the question that follows. Based on the figures, what are the effect of complete selection, migration, and random genetic drift on the gene and genotypic frequencies of the population? Describe the trend for each scenario and provide a brief explanation. a. complete selection against recessive individuals b. migration c. random genetic drift (random mating in a very small population)arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Concepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax College
Concepts of Biology
Biology
ISBN:9781938168116
Author:Samantha Fowler, Rebecca Roush, James Wise
Publisher:OpenStax College
Genetic Variation and Mutation | 9-1 GCSE Science Biology | OCR, AQA, Edexcel; Author: SnapRevise;https://www.youtube.com/watch?v=bLP8udGGfHU;License: Standard YouTube License, CC-BY