Biology: Life on Earth with Physiology (11th Edition)
11th Edition
ISBN: 9780133923001
Author: Gerald Audesirk, Teresa Audesirk, Bruce E. Byers
Publisher: PEARSON
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Chapter 16.3, Problem 2TC
When selection is directional, is there any limit to how extreme the trait under selection will become? Why or why not?
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Chapter 16 Solutions
Biology: Life on Earth with Physiology (11th Edition)
Ch. 16.1 - define evolution in terms of concepts from...Ch. 16.1 - define equilibrium population and describe the...Ch. 16.2 - Evolution of a Menace The mutant alleles that...Ch. 16.2 - describe how mutation, gene flow, genetic drift,...Ch. 16.2 - A flu vaccination stimulates your immune system to...Ch. 16.2 - If it were true that mutations do occur in...Ch. 16.2 - Explain how the distribution of genotypes in...Ch. 16.2 - If a population grows large again after a...Ch. 16.2 - Prob. 4TCCh. 16.3 - describe why selection of phenotypes can affect...
Ch. 16.3 - A team of phys clans treated four patients with...Ch. 16.3 - If we studied a population of bighorn sheep and...Ch. 16.3 - explain how competition and predation influence...Ch. 16.3 - When selection is directional, is there any limit...Ch. 16.3 - Prob. 3CYLCh. 16.3 - Microbiologists have discovered that alleles...Ch. 16.3 - compare and contrast directional selection,...Ch. 16 - In North America, the average height of adult...Ch. 16 - The ______ provides a simple mathematical model...Ch. 16 - The alleles responsible for antibiotic resistance...Ch. 16 - What is a gene pool? How would you determine the...Ch. 16 - By the 1940s, the whooping crane population had...Ch. 16 - Different versions of the same gene are called...Ch. 16 - Stabilizing selection on a trait tends to a. make...Ch. 16 - Define equilibrium population. Outline the...Ch. 16 - An organisms ______ refers to the specific alleles...Ch. 16 - An adaptation is a. any trait that arises from a...Ch. 16 - How does population size affect the likelihood of...Ch. 16 - A random form of evolution is called ________....Ch. 16 - Which of the following statements about mutations...Ch. 16 - If you measured the allele frequencies of a gene...Ch. 16 - Competition is most Intense between members of...Ch. 16 - Genetic drift occurs a. when different phenotypes...Ch. 16 - People like to say that you cant prove a negative....Ch. 16 - The evolutionary fitness of an organism is...Ch. 16 - Describe the three ways in which natural selection...Ch. 16 - What is sexual selection? How is sexual selection...
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- In a system that meets the requirements for Hardy-Weinberg equilibrium 25% of individuals exhibit the recessive phenotype for a trait. What is the allele frequency of the dominant allele?arrow_forwardWhat evolutionary factors can cause allele frequencies to change and possibly lead to a genetic polymorphism? Discuss the relative importance of each type of process.arrow_forwardWhich of the following is NOT a valid evolutionary explanation for why aging (or senescence) happens? Selected answer will be automatically saved. For keyboard navigation, press up/down arrow keys to select an answer. a b с d Alleles that reduce survival late in life, after most individuals have reproduced, will have a smaller effect on fitness than alleles that affect survival or reproduction early in life. Alleles that affect survival or reproduction early in life will have a smaller effect on fitness than alleles that reduce survival late in life. Alleles that increase reproductive rates early in life sometimes have trade-offs that reduce later survival. 2 Many deaths of younger individuals are due to causes unrelated to life history such as predation, reducing the effects that aging has on fitness.arrow_forward
- Selection confers a reproductive advantage to individuals based on their adaptations, and therefore causes the alleles carried by those individuals to increase in the population. Selection can be simulated by having your partner remove any three individuals of a particular suit as you deal the cards into a pile. The fitness of that variant is therefore 0.77 (10/13 survive), while the fitness of the other three variants remains at 1.0 (13/13 survive). Recalculate allelic (suit) frequencies after selection. 1. What is the effect of selection on reproduction, allelic diversity, and frequency? 2. What would happen if similar selection continued over several generations? Cite references.arrow_forwardYou are studying two genetic loci that are on the same chromosome. One of the loci is a gene that produces darker feathers in dark environments in birds. The second locus is a gene associated with metabolism. In your research you find that the second locus is not under selection, but the first locus is undergoing positive selection. The positive selection at the first locus is increasing a specific allele at the second locus. This discovery of yours is best described as which of the following? a. Recombinaton b. Linkage equilibrium c. Genetic hitchhiking d. Chromosome inversionarrow_forwardIn a population, the dominant phenotype of a certain trait occurs 91% of the time. What is the frequency of the dominant allele?arrow_forward
- Is it true that natural selection allows only the better alleles to be passed onto the next generation? Please explain in details. The explaination should either agree or disagree, not be in the middle.arrow_forwardWhat is the intuitive meaning of the mean fitness of a population? How does its value change in response to natural selection?arrow_forwardWhat is the ultimate cause of variation in populations?arrow_forward
- Which of the following is an example of environmental impacts on the expression of traits? Heterozygous individuals of a plant species have pink flowers, whereas homozygous individuals have either red or white flowers. An individual’s blood type depends on the interaction of the alleles A, B, or O. Animal coat color shifts in response to seasonal changes in day length and temperature.arrow_forwardIn a large population, dairy cows were selected for high milk production. What do you expect to happen with the genes affecting milk production? Do you expect to see a higher or lower variability of alleles after several years of selection?arrow_forwardIn a population the homozygous dominant individuals made up 70% of the population, while heterozygous ones made up 21%, and recessive made up 9%. What are the frequencies of the A and a alleles?arrow_forward
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