BIOLOGY
12th Edition
ISBN: 9781260169614
Author: Raven
Publisher: RENT MCG
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Textbook Question
Chapter 20, Problem 1IQ
Why are rare alleles particularly likely to be lost in a population bottleneck?
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Why do recessive lethals persist in a population? Provide an example of a recessive lethal allele.
Why is the minimum viable population size smaller for a geneticallydiverse population than for a less genetically diverse population?
a. Population - Parent Generation
i) What is the blue phenotype frequency?
ii) What is the Aa genotype frequency?
iii) What is the A allele frequency?
b. Population 2 - Offspring of parent generation above
i) What is the blue phenotype frequency?
ii) What is the Aa genotype frequency?
iii) What is the A allele frequency?
c. Is this population evolving? Please explain why or why not.
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Chapter 20 Solutions
BIOLOGY
Ch. 20.1 - Define evolution and population genetics.Ch. 20.1 - Prob. 2LOCh. 20.2 - Explain the HardyWeinberg principle.Ch. 20.2 - Describe the characteristics of a population that...Ch. 20.2 - Prob. 3LOCh. 20.3 - Define the five processes that can cause...Ch. 20.3 - Prob. 2LOCh. 20.4 - Prob. 1LOCh. 20.4 - Prob. 2LOCh. 20.4 - Demonstrate how the success of different...
Ch. 20.5 - Prob. 1LOCh. 20.5 - Prob. 2LOCh. 20.5 - Prob. 3LOCh. 20.6 - Define frequency-dependent selection, oscillating...Ch. 20.6 - Prob. 2LOCh. 20.7 - Define and contrast disruptive, directional, and...Ch. 20.7 - Prob. 2LOCh. 20.8 - Explain how experiments can be used to test...Ch. 20.9 - Prob. 1LOCh. 20.9 - Prob. 2LOCh. 20.10 - Prob. 2LOCh. 20 - If all white cats died, what proportion of the...Ch. 20 - Assuming that the values on the x-axis represent...Ch. 20 - Prob. 3DACh. 20 - Prob. 4DACh. 20 - Examine the index of copper tolerance on nonmine...Ch. 20 - Prob. 6DACh. 20 - Why are rare alleles particularly likely to be...Ch. 20 - Prob. 2IQCh. 20 - Prob. 3IQCh. 20 - Prob. 4IQCh. 20 - Prob. 5IQCh. 20 - Prob. 6IQCh. 20 - Prob. 7IQCh. 20 - Prob. 8IQCh. 20 - Prob. 9IQCh. 20 - Assortative mating a. affects genotype frequencies...Ch. 20 - When the environment changes from year to year and...Ch. 20 - Many factors can limit the ability of natural...Ch. 20 - Stabilizing selection differs from directional...Ch. 20 - Founder effects and bottlenecks are a. expected...Ch. 20 - Relative fitness a. refers to the survival rate of...Ch. 20 - For natural selection to result in evolutionary...Ch. 20 - Prob. 8UCh. 20 - In a population of red (dominant allele) or white...Ch. 20 - Genetic drift and natural selection can both lead...Ch. 20 - Prob. 3ACh. 20 - Prob. 4ACh. 20 - In Trinidadian guppies a combination of elegant...Ch. 20 - On large, black lava flows in the deserts of the...Ch. 20 - Based on a consideration of how strong artificial...
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- Does having a dominant allele mean that it will be found in greater frequency in the population? Explainarrow_forwardIn a population of 12,500 jewel beetles that is in H-W equilibrium, 1280 beetles show the recessive green wing coloration, while the remaining beetles show the dominant blue wing colour. a) What are the frequencies of the blue and green wing alleles in this population? Enter allele frequencies to two decimal places. p= q= b) How many jewel beetles in this population are homozygous for the dominant allele? c) If you collected a second sample of 3125 jewel beetles, how many of the blue beetles would you expect to be heterozygous?arrow_forwardWhat does it mean when alleles in a population coalesce?arrow_forward
- What long-term effects can gene flow have on any two populations that are exchanging genes? View keyboard shortcutsarrow_forwardWhy is genetic variability necessary in a population? What can happen if genetic variability is reduced?arrow_forwardWhy do you think a genetic bottleneck is more likely to occur in a small population than in a large population?arrow_forward
- Will the bottleneck effect most likely increase or decrease the genetic variation of a population? Pick one and explain why.arrow_forwardIf (positive) assortative mating increases in a population, what would expect to happen to genotype frequency over generations? O a) Frequency of the heterozygous genotype will increase. b) Frequency of the homozygous genotypes will decrease. O c) Frequency of the homozygous genotypes will increase. O d) There will be no change in genotype frequency.arrow_forwardThe frequency of a recessive allele in a population is 50%. What is the frequency of the dominant allele?arrow_forward
- American cat breeders are trying to establish a new breeed of cat with unusual, curled-back ears, to be known as the "curl cat." Suppose you found a curl cat and wanted to secretly start your own population. How would you determine whether the curl allele is dominant or recessive? How would you establish and maintain a true breeding population based on whether the allele is dominant or recessive?arrow_forwardWhich of the following is TRUE in a population in Hardy-Weinberg equilibrium? a) The genotype that has the greatest selective advantage (i.e. evolutionary benefit) will increase in frequency over generations. O b) The genotype and allele frequency will remain nearly constant over generations. O c) The rate of mutation and the rate of migration are roughly equal. O d) The population will drastically decrease in size as the result of a bottleneck event.arrow_forwardWhich of the following is TRUE in a population in Hardy-Weinberg equilibrium? O a) The population will drastically decrease in size as a result of a bottleneck event. O b) The recessive allele will decrease in frequency over generations until it disappears. c) The genotype that has the greatest selective advantage (i.e. evolutionary benefit) will increase in frequency over generations. d) The rate of mutation and the rate of migration are roughly equal. O e) The genotype and allele frequency will remain nearly constant over generations.arrow_forward
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