BIOLOGY
12th Edition
ISBN: 9781260169614
Author: Raven
Publisher: RENT MCG
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Question
Chapter 20, Problem 3A
Summary Introduction
Introduction:
Stabilizing selection is a type of natural selection process that favors the average individuals within the given population. Stabilizing selection occurs when the extremes of the trait are not well suited.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
During a 10-minute interval, adult worms switch from eating to egglaying with probability 0.1 and from egg-laying to eating with probability 0.15. a. Draw a diagram illustrating this process. b. Derive a discrete-time dynamical system for the probability the worm is eating. c. Find the long-term fraction of time spent eating. d. If egg-laying takes place at a rate of 1.5 per 10 minutes, about how many eggs would this worm lay during its 15-day life (worms never sleep)?
Suppose a study looking at the association between smoking and bladder cancer found an odds ratio = 2.4. What would be the best way to interpret this? (Select one answer.)
Smokers are 140% times as likely to develop bladder cancer compared to non-smokers.
People with bladder cancer are about 40% more likely to be smokers compared to people who don't have bladder cancer.
Smokers have a 2.4 % more risk of bladder cancer compared to nonsmokers.
Smokers have 2.4 times the risk of developing bladder cancer compared to non-smokers.
After observing a finite population of asexually reproducing salamanders, which of the following outcomes is consistent with Müller’s ratchet?
a.
The population fitness will decline due to the least fit individuals randomly not surviving to produce offspring into the next generation.
b.
The population fitness will increase due to the most fit individuals randomly not surviving to produce offspring into the next generation.
c.
The population fitness will decline due to the most fit individuals randomly not surviving to produce offspring into the next generation.
d.
The population fitness will increase due to the least fit individuals randomly not surviving to produce offspring into the next generation.
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...
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
- (A) G= N K-N) K (C) (B) (х-аxis) Question: Which of the following labels for x- and y- axes best fit the graph? O a. x= Birth; y= No. of individuals O b. x= Time; y= No. of individuals O C. x= Birth; y= Death d. x= Time; y= Population growth (sıxe-A)arrow_forwardSuppose that you are interested in estimating a population mean. You select a random sample of items, and compute the sample mean and the sample standard deviation. You then compute a 95% confidence interval to be LCL=28.4 - UCL=37.9. So what does that mean? It means that you are 95% confident that the unknown population mean that you are estimating is between the LCL and UCL. So what does that mean? It means that if you were to iterate this sampling process many times, say 100, and calculate 100 confidence intervals, then 95 of those intervals will contain the unknown population mean, and 5 will not. Give me an example of how CI can be used in your work. FYI I work in Endocrinology dept. Specific diabetesarrow_forwardSuppose a population of mice is subject to a few years of very cold, dry winters that drastically decreases their numbers. After the decrease in population size, there was a population of 200 mice, with 182 showing the dominant long tail phenotype and 18 showing the recessive short tail phenotype. a. What is the frequency of the recessive allele? b. What is the frequency of the dominant allele?arrow_forward
- Consider a locus with two alleles (b1 and b2) in a population of bacteria (bacteria are haploid). Assume that b1 individuals have a reproductive rate 8% higher than b2 individuals. The b1 and b2 alleles do not affect survival. Write an equation for the expected generation to generation change in the frequency of the b1 allele.arrow_forwardMonarch butterflies are a migratory species that flies south once during the lifetime of an individual. One specific population flies to Cuba, where it encounters and shares habitat with resident monarchs that do not migrate and stay within Cuba their entire lifespan. The table shows comparisons between the two populations. What data indicate the greatest difference between the populations? A. Male to female ratioB. Difference in wing sizeC. Higher mean weightD . Average of wing anglearrow_forwardWhich statement best explains why an understanding of life-history trade-offs is important when examining the fitness of an organism? A. Because individuals may not be producing the maximum number of offspring they possibly can in any particular breeding season. B. Because in any particular breeding season, individuals may need to produce fewer offspring to enhance their own survival. C. Because individuals need to live longer, so they will not produce the maximum number of offspring each season. D. Because when individuals need offspring, they can choose whether to reproduce or not.arrow_forward
- If 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_forwardThe graph below shows values for body size in parents and offspring. The data shown are consistent with which of the following situations. ANSWER CHOICES A. variation in body size is completely due to variation in the environment (heritability is 0) B. most of the variation in body size is due to variation in the environment but there is a small effect of genes (heritability is around 0.2) C. variation in body size is completely due to variation in genes (heritability is 1.0) D. most of the variation in body size is due to variation in genes but there is some effect of the environment (heritability is about 0.8)arrow_forwardConsider the variables: A, B, C, D, E, F, G, and H. A and B, B and C, C and D are directly related while D and E, E and F, F and G, and G and H are inversely related. If an initial increase occurs in the value of A, the value of H will a. decrease b. increase c. stay the same d. cannot predict from the given informationarrow_forward
- Suppose you want to examine the effect of a fertilizer on the size of eggplant produced, and therefore, you need to establish the experimental and control groups. A. What could represent the control group? B. What will be your experimental group? C. What will be the best way to establish a relationship between your two variables?arrow_forwardThere is a population of cats and 16% of the cats this population show a recessive trait. a. What is the frequency of the recessive allele? b. What is the frequency of the dominant genotype? c. What is the frequency of cats with the heterozygous genotype?arrow_forwardIf something happened in North America to decrease the wolf population, how would this affect the deer population? how would the graph from (e) change?arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Biology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage Learning
Biology (MindTap Course List)
Biology
ISBN:9781337392938
Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Publisher:Cengage Learning
Mendelian Genetics and Punnett Squares; Author: Professor Dave Explains;https://www.youtube.com/watch?v=3f_eisNPpnc;License: Standard YouTube License, CC-BY
The Evolution of Populations: Natural Selection, Genetic Drift, and Gene Flow; Author: Professor Dave Explains;https://www.youtube.com/watch?v=SRWXEMlI0_U;License: Standard YouTube License, CC-BY