Biological Science (6th Edition)
6th Edition
ISBN: 9780321976499
Author: Scott Freeman, Kim Quillin, Lizabeth Allison, Michael Black, Emily Taylor, Greg Podgorski, Jeff Carmichael
Publisher: PEARSON
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Textbook Question
Chapter 23, Problem 13PIAT
Do these data illustrate directional, stabilizing, disruptive, or balancing selection? Justify your answer in terms of fitness.
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Applying Hamilton’s Rule, will natural selection favor helping a half sibling if the incremental fitness benefits to him are 6 times greater than the fitness costs to the helper? Explain your logic with a calculation.
What is Darwinian fitness? What types of characteristics canpromote high fitness values? Give several examples.
If both mutation and drift are acting simultaneously, predict how this will influence variation in that population. Will variation increase, decrease, or be maintained at some equilibrium, etc.? (note: consider how mutation and drift each affect variation within a population).
Chapter 23 Solutions
Biological Science (6th Edition)
Ch. 23 - PROCESS OF SCIENCE In what sense is the...Ch. 23 - 2. Why isn’t inbreeding considered an evolutionary...Ch. 23 - 3. CAUTION Why is genetic drift aptly named?
a. It...Ch. 23 - 4. True or false? Gene flow can either increase or...Ch. 23 - 5. QUANTITATIVE In a population of 2500, how many...Ch. 23 - 6. In the 1700s and 1800s, royalty in Europe often...Ch. 23 - 7. CAUTION Determine what is incorrect in the...Ch. 23 - MODEL Draw a small concept map (BioSkllls 12 )...Ch. 23 - 9. QUANTITATIVE In humans, albinism is caused by...Ch. 23 - Prob. 10TYPSS
Ch. 23 - Are toucans important to tropical forests? Human...Ch. 23 - QUANTITATIVE Toucans can eat fruits with large...Ch. 23 - 13. Do these data illustrate directional,...Ch. 23 - 14. Large seeds carry more resources than small...Ch. 23 - 15. PROCESS OF SCIENCE The data in the graphs are...Ch. 23 - 16. SOCIETY If you were a journalist covering this...
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- Define the term fitness and relate it to the meaning of selection coefficient.arrow_forwardWhich type of selection is represented from a population of mice living in the forest where only dark colored fur survive? Disruptive Directional Stabalizingarrow_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_forward
- you (should have) learned that selection alone cannot purge a population of the very last copy of a deleterious allele. If selection is unable to do so, which of the remaining mechanisms (of the five Hardy-Weinberg) assumptions is MOST LIKELY to do so? Justify your answer. That is, why is the mechanism you picked the most likely to get rid of that last copy of a harmful allele?arrow_forwardIf you measured the allele frequencies of a gene and found large differences from those predicted by the Hardy–Weinberg principle, would that prove that natural selection is occurring in the population you are studying? Review the conditions that lead to an equilibrium population, and explain your answer.arrow_forwardWhy is "fitness" in selection referred to "relative fitness"? Group of answer choices A_"Relative fitness" refers to fitness of a genotype relative to the environment that organisms are in B_"Relative fitness" refers to fitness of some genotypes relative to other genotypes in a populationarrow_forward
- Describe why fitness has a molecular basis. How does DNA play a role in an organism's fitness? Is DNA the only way an organism's fitness can be increased?arrow_forwardTake a look at an adaptable landscape with several fitness peaks. Why does a population of, say, a virus like SARS-Cov2 never evolve the best phenotype for a particular environment? Under what conditions may a population transition from one local fitness maximum to another?arrow_forwardWill the bottleneck effect most likely increase or decrease the genetic variation of a population? Pick one and explain why.arrow_forward
- A. Use the genotype frequencies, relative fitness, and the mean relative fitness to calculate the genotype frequencies expected to be found in the next generation Show your work, include 3 decimals. p2’ = 2pq’ = q2’ = B. Is natural selection acting in this population in this new environment?arrow_forwardIf after studying a population for a trait determined by a single pair of alleles you find that the population is not in equilibrium, what possible reasons might explain the lack of equilibriumarrow_forwardHow can negative traits that don't show up until old age continue in populations? (Why aren't they eliminated through natural selection?) As part of your answer, provide an example.arrow_forward
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