Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
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Chapter 19.1, Problem 2TYK
Summary Introduction
Introduction:
The natural selection can be described as an evolutionary change, in which the fittest organism is favored. In this case, the organism, which is able to adapt to the changing environment will increase due to being favored by nature.
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Which 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 breed
The process of natural selection can be described as
Group of answer choices
1. an organism changing during its life to be better suited for its environment
2. a cell dividing
3. traits that cause individuals to live longer or reproduce more are seen more often in the next generation
4. none of the above
In which of these examples can natural selection act on a trait and cause the population to evolve?
A population that is faced with extinction but has no genetic variation
A population where a lot of individuals have mutations, but none of the mutations relate to fitness
A population with no genetic variation, but where individuals have very high numbers of offspring
A population where a few individuals have mutations that allow them to develop traits for producing more offspring than other individuals
Chapter 19 Solutions
Principles of Biology
Ch. 19.1 - Prob. 1TYKCh. 19.1 - Prob. 2TYKCh. 19.1 - The phrase an organism evolves is incorrect....Ch. 19.1 - Prob. 1BCCh. 19.2 - Explain how geography played a key role in the...Ch. 19.2 - Prob. 2CCCh. 19.2 - Prob. 3CCCh. 19.2 - Prob. 1TYKCh. 19.2 - Homologous traits show similarities because the...Ch. 19.3 - What is the frequency of pink flowers in a...
Ch. 19.3 - Prob. 1TYKCh. 19.3 - Prob. 2TYKCh. 19.4 - Lets suppose the climate on an island abruptly...Ch. 19.4 - Prob. 2CCCh. 19.4 - Prob. 3CCCh. 19.4 - Prob. 4CCCh. 19.4 - Prob. 1TYKCh. 19.4 - Prob. 2TYKCh. 19.4 - Prob. 3TYKCh. 19.5 - How does the bottleneck effect undermine the...Ch. 19.5 - Prob. 1TYKCh. 19.5 - Prob. 2TYKCh. 19.5 - Prob. 1BCCh. 19.6 - How does migration affect the genetic compositions...Ch. 19.6 - Prob. 1BCCh. 19.6 - Prob. 1TYKCh. 19.6 - Populations that experience inbreeding may also...Ch. 19 - Prob. 1TYCh. 19 - An evolutionary change in which a population of...Ch. 19 - Homology occurs because different species occupy...Ch. 19 - Prob. 4TYCh. 19 - Prob. 5TYCh. 19 - Prob. 6TYCh. 19 - Prob. 7TYCh. 19 - Prob. 8TYCh. 19 - Prob. 9TYCh. 19 - The micro-evolutionary factor most sensitive to...Ch. 19 - Prob. 1CCQCh. 19 - Prob. 2CCQCh. 19 - A principle of biology is that populations of...Ch. 19 - Prob. 1CBQCh. 19 - Prob. 2CBQ
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- In 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_forwardIn the study of genetics, a model organism is one in which hypotheses can be tested and the results are usually true of most other organisms. For examining heredity and how different alleles affect traits in a population, a good model organism is one that has a short generation time and many offspring O is most like a wild population has only a few offspring that can be studied extensively most resembles humansarrow_forwardWhich factor is not required for natural selection to occur? variation within a population inheritance of traits selective pressure an anticipated change in the environment genetic differencesarrow_forward
- Natural selection places selection pressure on: Ogenotypes Ophenotypes the genetic make up of the population Ohow fast you can complete your assignments Ohow you can "trick" your classmates into giving you the answers without any contribution Obeing aware of leeches in our class...arrow_forwardNatural selection is based on all of the following except individuals who survive longer tend to have more offspring than those who die young genetic variation exists within populations Individuals adapt to their environments and, thereby, evolve populations tend to produce more offspring than the environment can support the best adapted individuals tend to reproduce morearrow_forwardWhich of the following is not a trait on which natural selection can act? a size of ears b fur/hair color c broken bones d thickness of furarrow_forward
- If both the forces of mutation and natural selection are acting on this population from generation to generation (and have been acting on this population for many many generations), what do you predict will happen to allele frequencies over successive generations? Allele frequencies will remain constant The frequency of the D allele will increase The frequency of the d allele will increasearrow_forwardThe offspring of better-adapted individuals are expected to make up a larger proportion of the next generation. Which mechanism of evolution best explains this event? Group of answer choices gene flow and genetic drift mutations and genetic drift mutations and nonrandom mating mutations and natural selectionarrow_forwardWhich of the following best describes natural selection? O It is a guess made by scientists about how life develops, but it has no hard evidence to support it. It is the idea that the strong survive and the weak die off. It is the idea that organisms with genetic traits that improve their ability to reproduce are more likely to pass those traits on to future generations. It is the idea that organisms naturally increase in complexity and intelligence with time.arrow_forward
- Natural Selection is an evolutionary force that acts at phenotypic and genetic level. At the genetic level, which of the following statements is correct about the action of this force: O Selection is random and doesn't need genetic diversity in the population O Selection decreases the genetic diversity in the population O Selection is always negative and makes traits undesirable O Selection creates new alleles in the populationarrow_forwardWhich of the following statements about genetic fitness and/or selection is false? Group of answer choices Individuals with low fitness have greater selection coefficients Fitness involves both relative viability and reproductive success Individuals with high fitness have greater selection coefficients Selection against recessive alleles tends to be slower overall than dominant alleles because of the survival in heterozygotesarrow_forwardIf natural selection is the only force acting on this population from generation to generation, what do you predict will happen to allele frequencies over successive generations? The frequency of the d allele will increase Allele frequencies will remain constant The frequency of the D allele will increasearrow_forward
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Mechanisms of Genetic Change or Evolution; Author: Scientist Cindy;https://www.youtube.com/watch?v=5FE8WvGzS4Q;License: Standard Youtube License