Biology: The Unity and Diversity of Life (MindTap Course List)
14th Edition
ISBN: 9781305073951
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Textbook Question
Chapter 17, Problem 2SQ
Which is required for evolution to occur in a population?
- a. random mating
- b. selection pressure
- c. gene flow
- d. none of the above
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Which one of the four forces of evolution has the smallest effect on changing allele frequencies?
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Chapter 17 Solutions
Biology: The Unity and Diversity of Life (MindTap Course List)
Ch. 17 - ___ is the original source of new alleles. a....Ch. 17 - Which is required for evolution to occur in a...Ch. 17 - Prob. 3SQCh. 17 - Prob. 4SQCh. 17 - The persistence of sickle-cell anemia in a...Ch. 17 - ___ tends to keep populations of a species similar...Ch. 17 - The theory of natural selection does not explain...Ch. 17 - Prob. 1DAACh. 17 - Prob. 2DAACh. 17 - Prob. 3DAA
Ch. 17 - Prob. 4DAACh. 17 - Which of the following is not part of how we...Ch. 17 - Sex in many birds is typically preceded by an...Ch. 17 - The difference between sympatric and parapatric...Ch. 17 - A fire devastates all trees in a wide swath of...Ch. 17 - Match the evolution concepts. ____ gene flow a....Ch. 17 - Change in allele frequency of a population is...Ch. 17 - Species have traditionally been characterized as...Ch. 17 - Rama the cama, a llama-camel hybrid, was born in...Ch. 17 - Two species or antelope, one from Africa, the...Ch. 17 - Prob. 4CT
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- Which type of selection results in greater genetic variance in a population? a. stabilizing selection b. directional selection c. diversifying selection d. positive frequency-dependent selectionarrow_forwardWhat branch of biology deals with the genetic makeup of populations? A. cytology B. ecology C. Mendelian genetics D. population genetics E. population ecologyarrow_forwardWhich is an example of directional selection after several generations on an island population from an original population that had an equal number of individuals with thin, moderate, and thick sized legs? A. Anolis lizards that have evolved thinner legs b. Anolis lizards that have evolved thin and thick legs c. Anolis lizards that have evolved moderate sized legs d. All of the above E. none of the abovearrow_forward
- Which statement best summarizes why genetic drift tends to impact small populations more than large populations? A. Small populations have a heterozygote advantage because heterozygotes are more common than homozygotes. B. Small populations have a smaller gene pool, so random changes influence them more. C. Small populations have a relatively large gene pool, so the founder effect stabilizes their alleles.D. Small populations tend to experience directional selection, making one phenotype more common.arrow_forwardWhat is the main cause of genetic variation between identical twins? A. genetic drift B. the movement of alleles through sexual reproduction C. mutations generated in the previous generation D. geographic variation within a population E. environmental effectsarrow_forwardWhat does “descent with modification” mean?a. Populations that change quickly are likely to become extinct.b. Inherited traits change from generation to generation.c. Tracing an evolutionary tree from top to bottom reveals changes inspecies diversity.d. Parents change their own features before passing them on to offspring.arrow_forward
- If two mouse populations do not interbreed but are found in the same area, they may form different species due to d. Adaptive radiation c. Spontaneous generation a. Geographic isolation b. Mutations OOOOarrow_forwardBlack-footed ferrets are an endangered weasel found in the Great Plains. If fire swept through the plains and only a few members of a population survive (lowering the gene pool) , what did they experience? a.Bottleneck Effect B.Founder Effect C.Mutation D.Natural Selectionarrow_forwardWhat is a cline? a. the slope of a mountain where a population lives b. the degree to which a mutation helps an individual survive c. the number of individuals in the population d. gradual geographic variation across an ecological gradientarrow_forward
- what would happen to the gene frequencies during this following scenarios? a. complete selection b. migration c. random genetic drift.arrow_forwardWhat is the difference between artificial selection (e.g., greyhounds that are bred for speed) and natural selection? a. In artificial selection, the genetic variation introduced into the population is limited, but in natural selection, it is not b. In artificial selection, the environment is the selective force, while in natural selection, humans are the selective force c. In natural selection, the environment is the selective force, while in artificial selection, humans are the selective force d. Unlike other species, dogs are not subject to natural selection e. Both A & Carrow_forwardThe main idea behind Darwin’s theory of natural selection was Group of answer choices a. Competition for space between the individuals will limit a population b. Individuals pass on acquired characteristics to their offspring c. Individuals with advantageous adaptations are more likely to out-produce those lacking that adaptation d. Populations adapt over timearrow_forward
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