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
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Textbook Question
Chapter 21, Problem 6TYU
A fruit fly population has a gene with two alleles, A1 and A2. Tests show that 70% of the gametes produced in the population contain the A1 allele. If the population is in Hardy- Weinberg equilibrium, what proportion of the flies carry both A1 and A2?
- A. 0.7
- B. 0.49
- C. 0.42
- D. 0.21
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Students have asked these similar questions
1) 10,000 individuals are sampled from a population and are found to display one of three blood types: AA with 6800 individuals, AB with 2800 individuals and type BB with 400 individuals.
a) What is the frequency of each genotype in the population?
b) What is the frequency of the A allele?
c) What is the frequency of the B allele?
d) If the next generation contains 25,000 individuals, how many would have blood type BB, assuming the population is in Hardy-Weinberg Equilibrium?
Which option would not disturb a Hardy-Weinberg Equilibrium in a population?
a) Random mating
b) Gene flow
c) Genetic drift
d) Genetic mutation
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 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...
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- A fruit fly population has a gene with two alleles, A1 and A2.Tests show that 70% of the gametes produced in the populationcontain the A1 allele. If the population is in Hardy-Weinbergequilibrium, what proportion of the flies carry both A1 and A2?(A) 0.7 (B) 0.49 (C) 0.42 (D) 0.21arrow_forwardIf predicted genotypic frequencies do not match actual genotypic frequencies, what is true of the population? a It is changing. b It is in equilibrium. c The frequencies are unpredictable. d The sample population was too large.arrow_forwardIn which situation will populations experience gene flow? A)hybridization between two populations of ground beetles B)natural-selection pressures between two populations of dragonflies C)mate competition between two populations of red-legged grasshoppers D)intersecting migration routes between two populations of monarch butterfliesarrow_forward
- A biologist is conducting an experiment that involves a colony of fruit flies. (Biologists frequently study fruit flies because their short life span allows the experimenters to easily study several generations.) One day, there were 2,730 flies in the colony. Three days later, there were 5,780. c.(Use the model to predict when the population will be double its initial size.)arrow_forwardWhat method would you use to estimate the size of the following populations a. Canada Geese b. Bacteria in a petri dish c. Jaguars that are rarely seen d. Dandelion weeds in a lawn e. Butterfliesarrow_forwardIn a hypothetical species of mice, the shaggy gene determines hair length. S is the dominant allele and confers the short hair phenotype. Homozygous ss individuals have long hair. There are 422 long-haired mice and 278 short-haired mice in the population. How many shaggy gene alleles are in this population? a- 700 b- 350 c- 2800 d- 1400arrow_forward
- Which of the following is microevolution? A. The average wing length of a single population of pigeons living in New York City decreased over a period of 150 years b. the growth and wing-size of a single population of Florida Jaybirds originally living in Destin, Florida has steadily declined and decreased over 25 years C. A woman's leg muscles increase in strength and bulk after he starts working out D. A and Barrow_forwardA meadow is home to a population of plants of a particular species. Among these individuals are 125 plants that have red flowers and 375 plants that have white flowers. The allele of the flower color gene that produces red flowers (R) is completely dominant over the white flower color allele (r). Which statement about this population of plants is true? Group of answer choices a. 75% of the flower color alleles are the R allele. b. 13% of the flower color alleles are the R allele. c. 25% of the flower color alleles are the R allele. d. 87% of the flower color alleles are the R allele.arrow_forwardThere are seven conditions needed to maintain Hardy-Weinberg equilibrium. What is the likelihood that a real population will meet all seven conditions? a highly likely b somewhat likely c somewhat unlikely d highly unlikelyarrow_forward
- What is a cline? A. A gradual change in genetic or phenotypic characteristics of a population within a set geographic space. B. A gradual change in genetic or phenotypic characteristics of a population over geographic space. C. Similar genetic or phenotypic characteristics of a population within the same geographic space. D. Discrete changes in genetic or phenotypic characteristics of a population over geographic space.arrow_forwardWhich is an example of directional selection after several generations on an island population from an original population that had an equal number of individuals with thin, moderate, and thick sized legs? A. Anolis lizards that have evolved thinner legs b. Anolis lizards that have evolved thin and thick legs c. Anolis lizards that have evolved moderate sized legs d. All of the above E. none of the abovearrow_forwardIn the population of insects shown, insects with spots have the genotype Aa or AA and bugs with no spots have the genotype aa. Which argument best supports the phenomenon shown in the diagram? There was an increase in the fitness of the gene A. There was an increase in the fitness of the gene a. There was an increase in the mutation rate of gene A. There was an increase in the mutation rate of gene a.arrow_forward
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