BIO 102 CH 22 HW
The mean beak depth of G. magnirostris is about __ mm.
18
The beak length of G. fortis ranges from approximately __ to __ mm.
8, 12
A farmer wishes to develop a strain of high-yield corn that is also resistant to drought. He has the following individuals from the current year's crop:Individual A—Yield: 179 bushels/acre; drought resistance: highIndividual B—Yield: 220 bushels/acre; drought resistance: lowIndividual C—Yield: 185 bushels/acre; drought resistance: mediumIndividual D—Yield: 140 bushels/acre; drought resistance: highIndividual E—Yield: 200 bushels/acre; drought resistance: mediumWhich of the following crosses would produce the highest corn yield with the highest resistance to drought?
A and E
Which of the following organisms could be produced by artificial selection?
A cow that produces a large quantity of milk.
In the projected video showing the growth of bacteria, why did the bacteria grow up to the edge of the area with antibiotics, pause, then continue to grow across the area with antibiotics?
A few bacteria experienced random mutations in their DNA, which allowed some of them to grow even though antibiotics were present.
What does it mean that organisms have a nearly universal genetic code?
A specific DNA sequence encodes the same information in one species as it would in nearly any other.
Which term describes a trait that increases an individual's ability to survive in a particular environment?
Adaptation
Which of the following observations most strongly supports the common origin of all life on Earth?
All organisms use essentially the same genetic code.
Which of the following correctly describes what the video referred to as a "microbial cure"?
Antibiotics are used to kill all of the infectious bacteria in a person.
Which of the following statements best defines artificial selection?
Artificial selection is a process in which humans decide which plants and/or animals will and will not breed.
The cow Bos primigenius (which is farmed for meat and milk) has a smaller brain and larger eyes than closely related species of wild ungulates. Which of the following statements best describes the process that led to differences between domesticated/farmed cows and their wild relatives?
Artificial selection resulted in changes in the lineage leading to domesticated cows because humans wanted animals with high milk output and high muscle content.
Over time, bacteria have become increasingly resistant to antibiotics. Which of the following best explains this in terms of natural selection?
Bacteria that happen to have natural resistance to antibiotics survived and reproduced.
Based on the video and what you know about natural selection, which of the following must be true if evolution is the explanation for what the Grants have observed over time on Daphne? Select all that apply.
Beak depth and length must be heritable. Beak depth and length must affect survival and/or reproduction of birds. Beak depth and length must show variation among individuals of a single species.
Darwin and Wallace made independent observations in different parts of the world. Which statements are true?
Both collected huge numbers of specimens and realized that individuals vary within species. Both witnessed nature up close and realized it was a battlefield with massive casualties. Both observed slightly different species on nearby islands and concluded that species could change over time.
What happened in the soapberry bug population in central Florida when the bugs began to feed on seeds from the goldenrain tree fruits which are much closer to the fruit surface?
Bugs with shorter beaks had more access to food, allowing them to produce more offspring.
The figure shows an outcrop of sedimentary rock whose strata are labeled A-D. If x indicates the location of fossils of two closely related species, then fossils of their most-recent common ancestor are most likely to occur in which stratum?
C
This experiment is an example of hypothesis-based science. What question did the researchers ask?
Can predation result in selection for color patterns in guppies?
Cotton-topped tamarins are small primates with tufts of long white hair on their heads. While studying these creatures, a scientist noticed that males with longer hair get more opportunities to mate and that they father more offspring than males with shorter hair. Which of the following possible studies would be the best design for testing if longer hair is an adaptive trait? Assume that hair length is a trait that is inherited.
Capture a group of males with long hair at random, and cut the hair very short in half of the males; then, compare the number of matings of males with their hair left unchanged vs. males with shortened hair.
Which of the following statements best describes Darwin's theory of evolution by natural selection?
Darwin's theory emphasized that populations vary and change over time.
What is the meaning of Darwin's expression "descent with modification"?
Descent with modification refers to evolutionary change over time.
No two species of anoles lizards living in the same geographical location have dewlaps of the same size, shape or color. Why?
Dewlap color is under strong selection. Dewlaps that contrast with a lizard's environment are more effective for communication. Male anole lizards use dewlaps to court females. Differences in dewlaps keep different anole species reproductively isolated, even when they live together. Female anole lizards distinguish males of their own species from males of other species by their dewlaps.
DNA evidence suggests that anole lizard species from the four largest Caribbean islands are related as shown in the figure. Which statement is true?
Different body types evolved repeatedly and independently on each island.
What is the most important characteristic of anole lizard species that keeps members of one species from mating with members of another species?
Different species living in the same habitat have different dewlaps.
Which of the following statements about evolutionary trees is accurate?
Evolutionary trees are considered evolutionary hypotheses.
Big Birds likely eat seeds that are larger than the seeds that _____ eat and smaller than the seeds that ______ eat.
G. fortis, G. magnirostris
Based on beak dimensions, _________ likely eat the largest, hardest seeds
G. magnirostris
Which term describes the ability of a trait to be passed on to offspring?
Heritability
Which of the following statements is an accurate combination of postulates 1 and 2 of natural selection?
Heritable variation exists for traits among individuals in a population.
When dark-colored fur gives mice a 1% competitive advantage and 1% of the population begins with dark fur, in about 1000 years, 95% of the population will have dark fur. Which of the following statements is true?
If dark-colored rock pocket mice had a competitive advantage of 0.1%, it would take longer for 95% of the population to have dark fur.
Which of the following statements is an accurate combination of postulates 3 and 4 of natural selection?
Individuals experience differential success in their ability to survive or reproduce due to differences in certain traits.
Identify the four postulates of natural selection.
Individuals in a population vary in the traits they possess, Survival and reproductive success are variable among individuals in a population, Some trait differences are heritable, Individuals with certain traits are more likely to survive and reproduce.
Which of these conditions do NOT occur in populations evolving due to natural selection?
Individuals pass on most traits that they acquire during their lifetime.
It has been observed that organisms on many islands are different from, but closely related to, similar forms found on the nearest continent. Which of the following possible conclusions is best derived from this observation?
Island forms are descended from mainland forms.
Jonathan Losos and colleagues conducted experiments on small, hurricane-swept islands as "natural laboratories." Which of the following statements is true?
Islands scrubbed by hurricanes allow researchers to introduce new lizard populations and observe their evolution. There are many small islands with similar environments, meaning that researchers can repeat their experiments and observations in several locations. Natural selection can lead to rapid changes. The average leg length of lizard populations decreased within a few generations.
Which of the following statements is accurate about an organ described as vestigial?
It must be homologous to some feature in an ancestor.
Which pair of chickens should a farmer breed to produce larger chickens?
Large hen, large rooster
Which of the following statements best describes Linnaeus' method of classifying organisms?
Linnaeus grouped organisms into increasingly more inclusive categories.
Fossils of Thrinaxodon, a species that lived during the Triassic period, have been found in both South Africa and Antarctica. Thrinaxodon had a reptile-like skeleton and laid eggs, but small depressions on the front of its skull suggest it had whiskers and, therefore, fur. Thrinaxodon may have been endothermic (able to generate its own internal heat). Which of the following statements is likely most accurate about Thrinaxodon?
Mammals evolved from a relative of Thrinaxodon.
What did Wallace conclude from observing that the bones in manatee flippers look similar to the bones in a human arm and hand?
Manatees' arm and finger bones are evidence that manatees share a common ancestor with land mammals.
Identify the pair of homologous structures.
Maple leaf and oak leaf
Which of the following observations led to Darwin's major inferences?
Members of a population vary in their heritable traits. And although organisms can produce huge numbers of offspring, many of these offspring do not survive.
When Charles Darwin set sail on the HMS Beagle, what did he and most of his contemporary scientists think about the origin of species?
Most scientists, including Darwin, thought each species was specially created by God in its present form and did not change over time.
Which of the following statements about natural selection is true?
Natural selection favors individuals that reproduce more than others.
What does Dr. Carroll mean when he says, "while mutation is random, natural selection is not"?
Natural selection favors some mutations, Natural selection acts on traits, Mutations for advantageous traits are more likely to be passed on to the next generation.
The upper forelimbs of humans and bats have fairly similar skeletal structures, whereas the corresponding bones in whales have very different shapes and proportions. However, genetic data suggest that all three kinds of organisms diverged from a common ancestor at about the same time. Which of the following is the most likely explanation for these data?
Natural selection in an aquatic environment resulted in significant changes to whale forelimb anatomy.
Does the ability of a Mycobacterium tuberculosis cell to infect a new host depend on its drug-resistant phenotype?
No, drug-susceptible cells and drug-resistant cells are equally likely to infect a new host.
Which of the following statements is most consistent with data obtained from the fossil record?
Older strata carry fossils that differ greatly from living organisms.
What observations and evidence have Jonathan Losos and his colleagues gathered to support the theory of natural selection?
On each of the four large Caribbean islands, Losos observed the same distribution of anole lizard body types. When Losos and colleagues transplanted tree-dwelling anoles to small, hurricane-scrubbed islands without trees, the lizards evolved to have shorter legs after only a few generations. DNA evidence suggests that the different lizard body types (twig, grass, etc.) evolved independently on each of the four large Caribbean islands.
A particular antibiotic kills 99% of a bacterial population. What will be the result of the continued application of this antibiotic?
Over time, the antibiotic will become less effective at killing the bacteria.
Which of the following statements best describes evolution?
Populations change genetically from one generation to the next.
What was the researchers' main hypothesis?
Predation results in selection for more drab color patterns in guppies.
What conclusion would you draw from the data presented?
Predation results in selection for more drab coloration in pike-cichlid pools.
Which of the following statements is most accurate in comparing scientific theories and scientific hypotheses?
Scientific theories are supported by, and make sense of, many observations, whereas scientific hypotheses are narrow, testable ideas.
Within six months of effectively using methicillin to treat S. aureus infections in a community, all new S. aureus infections were caused by a resistant strain (MRSA). How can this best be explained?
Some drug-resistant bacteria were present at the start of treatment, and natural selection increased their frequency.
Which of the following observations helped Darwin shape his concept of descent with modification?
South American temperate plants are more similar to South American tropical plants than to European temperate ones.
Currently, two living elephant species (X and Y) are classified in the genus Loxodonta, and a third species (Z) is placed in the genus Elephas. Thus, which of the following statements would be accurate?
Species X and Y share a greater number of homologies with each other than either does with species Z.
After his journey on the HMS Beagle, Darwin made this now-famous sketch in his notebook. Which ideas does it represent?
Species descend from other species just as naturally as children come from parents, All species are linked to one another by common ancestry, All species are connected to one another in a "family tree."
Which of the following is an observation or inference on which natural selection is based?
Species produce more offspring than the environment can support.
In 1959, doctors began using the powerful antibiotic methicillin to treat infections of Staphylococcus aureus, but within two years, methicillin-resistant strains of S. aureus (MRSA) appeared. How did the resistant strains of S. aureus emerge?
Staphylococcus aureus bacteria that were able to synthesize cell walls using a protein that was not affected by methicillin survived the methicillin treatments and reproduced at higher rates than did other individuals. Over time, these resistant individuals became increasingly common.
Soapberry bugs use needlelike "beaks" to feed on seeds within the fruits of various plants. Bugs feed most successfully when their beak length matches the size of the fruit on which they are feeding. For 25 years, populations of soapberry bugs in central Florida have been feeding on small goldenrain tree fruits that were introduced to the area, rather than on the larger native balloon vine fruits that serve as food for other soapberry bug populations. Beak lengths of soapberry bugs are variable, but the average beak length is shorter in soapberry bug populations that feed on goldenrain tree fruits than in populations that feed on balloon vine fruits, as shown in the graph. How does natural selection act on beak length in soapberry bug populations?
The action of natural selection on beak length in soapberry bug populations varies with the environment.
Darwin and Wallace independently arrived at the same conclusion that species change over time. Which observations supported their conclusions?
The bony shells of armadillos resembled fossilized shells from the extinct Glyptodon. Mockingbirds from different Galapagos islands had subtle, consistent differences. Birdwing butterflies were found throughout the Malay archipelago, but species differed slightly from island to island. Tortoises from different Galapagos islands have distinct shells. The fossilized remains of giant sloths were similar to the smaller, living sloths Darwin encountered. Bird families clustered geographically: cockatoos in the Malay Archipelago and Australia, macaws and hummingbirds in the Americas.
Which observations led Darwin to establish a relationship between extinct and living animals?
The bony shells of armadillos resembled the shells of ancient Glyptodon fossils, The fossilized remains of giant sloths were found in places where smaller sloths now live.
In the United States today, about half of the corn crop is genetically engineered with a protein that is toxic to corn borers, an insect pest of corn. Which of the following conditions would be necessary for evolution of resistance to the toxic protein to occur in the corn borer?
The corn borer must have or generate (by mutation) heritable variation in resistance to the toxic protein. The resistant corn borers must survive better or reproduce more than nonresistant corn borers.
Which of the following statements describes the evolution by natural selection of Mycobacterium tuberculosis bacteria in their new environment?
The drug-resistance trait is an adaptation to the environment in which human hosts are medicated with the antibiotic rifampin.
Members of two different species possess a similar-looking structure that they use in a similar way to perform about the same function. Which of the following observations would suggest that the relationship more likely represents homology than convergent evolution?
The embryological development of the two structures are similar.
Claytonia virginica is a plant with flowers that vary from white, to pale pink, to bright pink. Slugs prefer to eat pink-flowering over white-flowering plants (due to chemical differences between the two), and plants experiencing severe herbivory are more likely to die. The bees that pollinate this plant also prefer pink over white flowers, so that Claytonia with pink flowers produce more seeds than Claytonia with white flowers. A researcher observes that the percentage of different flower colors remains stable in the study population from year to year. Given no other information, if the researcher removes all slugs from the study population, what do you predict will most likely happen to the percentage of flower colors in the population over time?
The percentage of pink flowers will increase over time.
A group of small fish live in a lake with a uniformly light-brown sandy bottom. Most of the fish are light brown, but about 10 are mottled. This fish species is often prey for large birds that live on the shore. A construction company dumps a load of gravel in the bottom of the lake, giving it a mottled appearance. Which of these statements presents the most accurate prediction of what will happen to this fish population?
The proportion of mottled fish will increase over time.
DDT was once considered a "silver bullet" that would permanently eradicate insect pests. Instead, DDT is now largely ineffective against many insects. Which of the following possible actions would have had the best chance of preventing this evolution of DDT resistance?
The use of DDT should have been interspersed with the use of other pesticides that have a different mode of action.
What is the concern about using antibacterial and antimicrobial soaps?
The use of any chemical that kills bacteria can eventually lead to resistance to that chemical in the population of bacteria.
As Wallace traveled the Malay Archipelago, he noticed that western islands had placental mammals, like monkeys. Eastern islands had marsupial mammals, like kangaroos. How did Wallace explain this distribution?
The western islands were once connected to Asia and the eastern islands had been connected to Australia. The islands had never been connected to each other.
Starting from the wild mustard Brassica oleracea, plant breeders have created the strains known as Brussels sprouts, broccoli, kale, and cabbage. Which of the following statements is correct with regard to the wild mustard?
There is enough heritable variation in the wild mustard to permit these different varieties.
Why do dark-colored rock pocket mice on dark lava flows have white bellies?
There is no selection for dark bellies by visual predators.
If the bacterium Staphylococcus aureus experiences a cost for maintaining one or more antibiotic-resistance genes, what would be most likely to happen in environments that lack antibiotics?
These bacteria would be outcompeted and replaced by bacteria that have lost the antibiotic resistance genes.
Why did dark-colored rock pocket mice first appear in a population of light-colored rock pocket mice?
They have a genetic mutation that affects their fur color.
Suppose that after 22 months, guppies from the transplanted population were returned to the source pool. What would most likely happen to those guppies?
They would experience a higher rate of predation than the native population, and over time they would evolve and resemble the original source population.
How did the types of data the researchers collected enable them to test their prediction?
Tracking the number and area of colored spots provided a quantitative way to compare the brightness of different populations.
A farmer uses triazine herbicide to control pigweed in his field. For the first few years, the triazine works well and almost all the pigweed dies; however, after several years, the farmer sees more and more pigweed growing once again in the fields. Which of the following statements best explains the return of pigweed to the farmer's fields?
Triazine-resistant weeds were more likely to survive and reproduce than were non-resistant individuals.
True or false? It would be difficult to assess whether the drug-susceptible or drug-resistant phenotype in a population of Mycobacterium tuberculosis was more fit in an environment without antibiotics.
True
Over long periods of time, many cave-dwelling organisms have lost their eyes. Tapeworms have lost their digestive systems. Whales have lost their hind limbs. How can natural selection account for these losses?
Under particular circumstances that persisted for long periods, natural selection reduced each of these structures because they presented greater costs than benefits.
In the lab, Nachman examined dark mice from two different populations living hundreds of miles apart. The mice looked nearly identical. Their dark color was caused by two different genes. What does this tell you?
Under very similar conditions, natural selection can favor very similar adaptations, Two completely different mutations in two separate genes can generate the same phenotype, Dark fur color evolved independently on each lava flow, There are at least two genes involved in creating dark mouse fur.
Which one of the following researchers developed a theory of evolution that was very similar to Charles Darwin's?
Wallace
Researchers further hypothesized that if predation pressure is reduced, drab coloration would become less beneficial (since females prefer brightly colored mates). Based on this hypothesis, what prediction did the researchers test in this experiment?
When guppies with drab colors are transferred to a pool with only killifish, the transplanted population will evolve brighter colors than the original source population.
Mutations are always
a change in an individual's DNA
An adaptation is
a trait that gives an organism a reproductive advantage in the current environment
Varieties of Staphylococcus aureus that are resistant to the drug methicillin __________.
already existed in the population before methicillin was developed. and were strongly selected for as methicillin became widely used to treat bacterial infections
Which of the following factors would most likely cause an increase in population size of a prey animal?
an improvement in eyesight
Given what we know about evolutionary biology, which of the following places would be the most likely to have the highest number of species that are unique to the area (that is, that had evolved in that place). Assume that the conditions have existed for at least a few million years.
an isolated group of ocean islands
Of the following anatomical structures, which is most homologous to the bones in the wings of a bird?
bones in the flippers of a whale
Darwin used the phrase "descent with modification" to explain which of the following ideas?
both the unity and diversity of life
A challenge to traditional (pre-1860) ideas about species came from embryology, when it was discovered that _____. See Concept 22.3 (Page)
embryos of dissimilar organisms, such as sharks and humans, resemble each other
In the video, what does the UK's Chief Medical Officer suggest for promoting the development of new antibiotics?
encouraging big pharmaceutical companies to start investing again in new drug research and development
The wing of a bat is homologous to the _____ of a whale.
flipper
Structures as different as human arms, bat wings, and dolphin flippers contain many of the same bones, which develop from similar embryonic tissues. These structural similarities are an example of ________.
homology
DNADNA sequences in many human genes are very similar to the sequences of corresponding genes in chimpanzees. The most likely explanation for this result is that
humans and chimpanzees share a relatively recent common ancestor.
Which of the following would help strengthen the researchers' conclusion?
if no other characteristics differed significantly between the source and transplanted populations
After a drought in 1977, researchers hypothesized that on the Galapagos Island Daphne Major, medium ground finches with large, deep beaks survived better than those with smaller beaks because they could more easily crack and eat the tough Tribulus cistoides fruits. A tourist company sets up reliable feeding stations with a variety of bird seeds (different types and sizes) so that tourists can get a better look at the finches. Which of the following events is now most likely to occur to finch beaks on this island?
increased variation in beak size and shape over time
A heritable trait is one that
is determined at least in part by genes passed from parents to offspring.
The theory of evolution through natural selection is considered a scientific theory because __________.
it is general enough to provide many testable hypotheses, it is supported by a massive body of evidence from many disciplines, and it is broad enough in scope to explain many observations
Which of the following is an example of an adaptation in anole lizards?
long legs in the anole lizards that live primarily on the ground and tree trunks
A bird with a very long, shallow beak (like a hummingbird) would appear on the graph in the _______
lower right quadrant.
Evolution of shorter legs in anole lizards placed on small, hurricane-scrubbed islands is an example of which type of evolution?
microevolution
From his observations of organisms in the Galapagos Islands, Darwin reasoned that
organisms had adapted to new environments, giving rise to new species
What data should you collect in order to test your prediction?
predation rate on transplanted versus original source guppies, and color patterns of the population over time
Charles Darwin
proposed natural selection as the mechanism of evolution
A biologist observes that a particular plant species is found in a forest but not in a nearby meadow. She hypothesizes that the plants could grow in the meadow but are not found there because their seeds have yet to land in the meadow. Which of the following would be the most appropriate way to scientifically evaluate this hypothesis?
scattering seeds in several areas of the meadow and observing whether they start to grow
The figure shows an outcrop of sedimentary rock whose strata are labeled A-D. If x indicates the earliest appearance of fossils of two closely related species, neither of which is extinct, then their remains may be found in which of these strata?
strata A and B only
Which of the following contributes the LEAST to the problem of antibiotic resistance?
taking the entire course of antibiotics as prescribed by the doctor
Which of the following is an example of the pattern of evolution?
the fossil record of the evolution of modern cetaceans
In this diagram, each fork represents which of the following ideas?
the most recent common ancestor of the subsequent species
What was the control group in this study?
the source population in the pike-cichlid pools
What was the experimental group in this study?
the transplanted population in the killifish pools
