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EBK BIOLOGY: CONCEPTS AND APPLICATIONS
9th Edition
ISBN: 8220100477805
Author: STARR
Publisher: CENGAGE L
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Chapter 17, Problem 2SQ
Summary Introduction
Introduction:
Evolution is the change in the
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Students have asked these similar questions
1. ____ occurs when allele frequencies change over generation due to random chance.
a. extinction
b. gene flow
c. natural selection
d. mutation
Evolution______ . a. is change in a line of descent b. is the same as natural selection c. is the goal of natural selection d. explains the origin of life
Match the evolution concepts. ___ gene flow a. outcome can be interdependence ___ sexual b. changes in a population’s allele selection frequencies due to chance alone ___ extinct c. alleles enter or leave a population ___ genetic d. adaptive traits make their drift bearers better at securing mates ___ coevolution e. no more living members ___ adaptive f. burst of divergences from one radiation lineage into many
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EBK BIOLOGY: CONCEPTS AND APPLICATIONS
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- Natural selection causes things to increase in frequency if they are good for _______. a. the species b. the population c. the individual d. the allele e. all of the above at the same timearrow_forwardwhich of these is not a central rule of natural selection a, fitness to the general health and strength of an organism b, natural selection can only act on traits that affect reproduction c, natural selection can't occur without population variation d, a trait must be inherited if natural selection is to act on itarrow_forwardThe modes of natural selection differ based on how selection acts on the _____ of a population. a color b environment c genotypes d phenotypesarrow_forward
- It is likely that, ancestrally, pocket mice were light colored. The dark coloration evolved recently in populations on the young, dark lava flows. For the evolution of dark pocket mice to occur, there must have been A. some individuals in the ancestral population that had mutations that made them darker than other individuals B. a large population of dark pocket mice somewhere in the species range in the ancestral population nC. a mutation that turned all light colored mice into dark colored mice at once N D. a gradual darkening of light colored mice during their lifetime so that they could occupy the dark lava flowarrow_forwardRate of evolution by selection is highest for an allele when it is _________ . a. wild type b. recessive c. dominant d. co-dominantarrow_forwardEvolution is a process of___ in a population through___ variation over___ Evolution involves___ and___.arrow_forward
- How is genetic drift like natural selection? A. They both depend upon the founder effect B. Both usually bring about adaptation to the environment C. They both cause gene frequency changes D. All of these are correct Mutations are __________. A. The sole source of variation in a sexually reproducing organisms B. The ultimate source of variation in sexually reproducing organisms C. Both genetic and chromosomal in nature D. All of these are correctarrow_forwardA trait is adaptive if it_____ . a. arises by mutation c. is passed to offspring b. increases fitness d. occurs in fossilsarrow_forwardPeople who are heterozygous for the cystic fibrosis gene are morelikely than others to survive a cholera epidemic. This heterozygoteadvantage seems to explain why homozygotes are maintained in thehuman population, and is an example ofa. disruptive selection.b. balanced polymorphism.c. high mutation rate.d. nonrandom mating.arrow_forward
- Sexual selection occurs whena. one sex has a higher fitness than the otherb. a species exhibits sexual dimorphismc. there is a male dominance hierarchy and only the alpha male reproduces. d. There is monogamous mating.e. A trait is favored by one sex such that individuals of the opposite sex possessing that trait have an increased likelihood of reproducing.arrow_forwardIn many bird species, sex is preceded by a courtship dance. If a male’s dance is unrecognized by the female, she will not mate with him. This is an example of______ . a. sexual selection c. reproductive isolation b. behavioral isolation d. all of the abovearrow_forwardWhich of the following is a factor that, by itself, does not promotewidespread changes in allele or genotype frequencies?a. New mutationb. Natural selectionc. Genetic driftd. Migratione. Nonrandom matingarrow_forward
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