Study Guide for Campbell Biology
11th Edition
ISBN: 9780134443775
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece, Martha R. Taylor, Michael A. Pollock
Publisher: PEARSON
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Chapter 23, Problem 2SYK
Summary Introduction
To determine:
Some of the factors that contribute and retain the genetic variability within the population.
Introduction:
The field of biology that deals with the study of the composition of genetic material within a population is called population genetics. Certain factors that lead to the process of evolution are natural selection, genetic drift, mutation, and migration; all these lead to changes in the genetic composition. Other selection processes that are involved in adaptive evolution involves the selection of a particular trait that gives rise to adaption according to the environment.
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Natural selection makes an adaptive trait more common in a population. After many generations, will all individuals in the population have the same adaptive trait?
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A population that is faced with extinction but has no genetic variation
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Chapter 23 Solutions
Study Guide for Campbell Biology
Ch. 23 - a. What is a major source of genetic variation for...Ch. 23 - In a population of 200 mice, 98 are homozygous...Ch. 23 - Use the allele frequencies you determined in...Ch. 23 - Practice using the Hardy-Weinberg equation so that...Ch. 23 - Prob. 5IQCh. 23 - Why hasnt the highly deleterious sickle-cell...Ch. 23 - a. What is Hardy-Weinberg equilibrium? b. Define...Ch. 23 - Prob. 2SYKCh. 23 - Prob. 1TYKCh. 23 - Prob. 2TYK
Ch. 23 - Prob. 3TYKCh. 23 - Prob. 4TYKCh. 23 - Mice have an estimated 1,000 olfactory receptor...Ch. 23 - Prob. 6TYKCh. 23 - If a population has the following genotype...Ch. 23 - In a population with two alleles, B and b, the...Ch. 23 - Prob. 9TYKCh. 23 - Prob. 10TYKCh. 23 - In a random sample of a population of shorthorn...Ch. 23 - Genetic drift is likely to be seen in a population...Ch. 23 - Porphyria variegata is a genetic disease...Ch. 23 - Cystic fibrosis is a very serious genetic disorder...Ch. 23 - Prob. 15TYKCh. 23 - Prob. 16TYKCh. 23 - Prob. 17TYKCh. 23 - Prob. 18TYKCh. 23 - Prob. 19TYKCh. 23 - Prob. 20TYKCh. 23 - Prob. 21TYK
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- Which of the following is not true of natural selection? (a) natural selection acts to preserve favorable traits and eliminate unfavorable traits (b) the offspring of individuals that are better adapted to the environment will make up a larger proportion of the next generation (c) natural selection directs the course of evolution by preserving the traits acquired during an individuals lifetime (d) natural selection acts on a populations genetic variability, which arises through mutation (e) natural selection may result in changes in allele frequencies in a populationarrow_forwardIn which of the following pairs do both evolutionary processes introduce new genetic variation into a population? a. natural selection and genetic drift b. mutation and gene flow c. natural selection and gene flow d. gene flow and genetic driftarrow_forwardNatural Selection Affects the Frequency of Genetic Disorders Will a recessive allele that is lethal in the homozygous condition ever be completely removed from a large population by natural selection?arrow_forward
- Natural selection is dependent on several factors, including the ability a population to survive and reproduce within a particular environment. How are both of these factors modeled?arrow_forwardWhich of the following is true about natural selection? Group of answer choices it acts on individuals it typically does not involve changes in genotype frequencies in a population it involves individuals willfully changing their genotype and/or phenotype in order to become better matched to their environment and leave more offspring it is a random process it involves humans increasing the frequency of desirable traits in a species by selecting which individuals breedarrow_forwardWhich aspect(s) of natural selection is(are) illustrated by the figure below? Check ALL answers that apply. A. Variation among individuals must be genetically transmissible to the next generation. B. Variation must exist in a population. C. Variation among individuals leads to differences in lifetime reproductive success. D. More individuals are produced each generation than the environment can support, resulting in competition for survival.arrow_forward
- Natural selection acts upon ____________________________, evolution upon _______________________________. What is the gene pool and how does natural selection act upon it? If a version of a gene confers an advantage to survival and reproduction, that version of the gene will be favored by natural selection and we can expect the frequency of that gene to ______________________ within the population over time. Versions of the gene that do not confer an advantage (or confer a disadvantage) should become _______________ prevalent . This generation to generation change in the gene pool is called ________________________. Changes to the genetic makeup of a population and the individuals within it can arise via two mechanisms. List and describe both. Both of these processes are ________________________________. Once created, new combinations of genes will be acted upon by _________new alleles_______________________. How is Darwinian “fitness” different than the typical definition used in…arrow_forwardIn the modern reckoning of evolution by natural selection, what is the most important feature that allows an allele to be more represented over time in a population? The allele makes the organisim stronger. The allele allows the organisim to produce more breeding offspring. The allele allows the organisim to eat more readily. The allele allows the organsims to escape predators readily.arrow_forwardWhich of the following statements about natural selection is a misconception? a.Most species don't produce more offspring than the environment can support b.Natural selection acts on heritable variations in a population c.Natural selection involves differential reproductive success d.Natural selection occurs as a result of competition among individuals in a population e.In natural selection, traits that are favoured depend on current environmental conditionsarrow_forward
- Which statement is accurate about natural selection? It is a biological process that prevents species from adapting to significant changes in their environments. It is a biological process that leads a population to have a widespread expression of an advantageous trait. It is a biological process that allows a population to have a competitive advantage in many environments. It is a biological process that causes certain traits to be expressed less with each subsequent generation.arrow_forwardThe domestication or breeding of animals to have as pets, livestock on farms, or for work purposes is a form of artificial selection. Charles Darwin used these practices to support his theory of species change by natural selection. How is artificial selection similar to natural selection? When animals with favorable traits are bred with animals with unfavorable traits, the offspring will have favorable traits, so breeders were changing species by removing certain traits. For artificial selection to work, only the strong survive to reproduce. By breeding animals with specific traits, breeders were able to produce a wide variety of breeds within a short period of time. Artificial selection involves breeding two different species and determining if a hybrid organism can be produced.arrow_forwardWhat kind of variable traits other than fur or lack of within a population might natural selection act uponarrow_forward
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