Campbell Biology in Focus (2nd Edition)
2nd Edition
ISBN: 9780321962751
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece
Publisher: PEARSON
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Textbook Question
Chapter 20.1, Problem 2CC
Which of the trees shown here depicts an evolutionary history different from the other two? Explain.
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Can you please explain this question and how to tell read these trees?
Fruit scientists are trying to determine the role of the pectinase (p) gene in a plant’s ability to tolerate cold conditions. The table shows each of three possible fruit tree genotypes and the percentage of fruit produced at different temperature ranges.
Which of the following statements best describes the evolutionary concept illustrated by this example?
A. Homozygous genotypes increase fitness in a population.
B. Hybrid plants are known to have a disadvantage over homozygous genotypes.
C. Natural selection selects against the recessive gene and for the dominant gene.
D. Certain phenotypic variations can significantly increase fitness of the organism in particular environments.
The data presented in Part D shows the results of artificial selection for hairy Wisconsin Fast Plants. Identify the null hypothesis for this investigation?
A. If the mean number of trichomes is greater in the second generation than in the parent population, then selection has occurred.
B. There will be no difference between the mean number of trichomes in the second generation compared to the parent population.
C. As a result of selection, the mean number of trichomes will be greater in the second generation.
D. If plants with the most trichomes in the first generation are selected as parents, then the second generation will have more trichomes.
Chapter 20 Solutions
Campbell Biology in Focus (2nd Edition)
Ch. 20.1 - Which levels of the classification in Figure 20.3...Ch. 20.1 - Which of the trees shown here depicts an...Ch. 20.1 - Prob. 3CCCh. 20.2 - Decide whether each of the following pairs of...Ch. 20.2 - WHAT IF? Suppose that two species, A and B, have...Ch. 20.3 - Prob. 1CCCh. 20.3 - The most parsimonious tree of evolutionary...Ch. 20.3 - WHAT IF? Draw a phylogenetic tree that includes...Ch. 20.4 - What is a molecular clock? What assumption...Ch. 20.4 - MAKE CONNECTIONS Review Concept 14.5. Then...
Ch. 20.4 - WHAT IF? Suppose a molecular clock dates the...Ch. 20.5 - Why is the kingdom Monera no longer considered a...Ch. 20.5 - Prob. 2CCCh. 20.5 - Prob. 3CCCh. 20 - In a comparison of birds and mammals, the...Ch. 20 - To apply parsimony to constructing a phylogenetic...Ch. 20 - Prob. 4TYUCh. 20 - Prob. 5TYUCh. 20 - If you were using cladistics to build a...Ch. 20 - Prob. 7TYUCh. 20 - SCIENTIFIC INQUIRY DRAW IT (a) Draw a phylogenetic...Ch. 20 - FOCUS ON EVOLUTION Darwin suggested looking at a...Ch. 20 - Prob. 10TYUCh. 20 - SYNTHESIZE YOUR KNOWLEDGE This West Indian manatee...
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- Which one of the four trees below, shows a different pattern of relationship as the three others? DA В E G H A B DE F G H A H E C D B A H F GE C DA B D C В D A O O O Oarrow_forwardHow does artificial selection differ from natural selection? Do you think the ancestors of lettuce had such soft, nonbitter leaves? Could today’s lettuce plants survive in natural conditions?arrow_forwardA farmer uses an herbicide called triazine to control pigweed in his field. Initially, the triazine works well and almost all the pigweed dies; but after several years, the farmer sees more and more pigweed. Which of these is the best explanation for what happened? Group of answer choices: Natural selection favored triazine-resistant pigweed, which was more likely to survive and reproduce. Some pigweed plants adapted to become resistant to triazine and passed the trait to their progeny. Natural selection caused the pigweed to mutate, creating a new triazine-resistant species. The herbicide company lost its triazine formula and started selling lower-quality triazine. Triazine-sensitive pigweed is less efficient at photosynthesis.arrow_forward
- O A B C D Which statement is true regarding the tree above? O A. A is more closely related to B than to C B. B is more closely related to D than to A O C. B is equally related to A and C O D. A is more closely related to C than to D.arrow_forwardWhich species on the chart (A,B,C,D,E,F,) is the common ancestorarrow_forwardPlease solvearrow_forward
- What taxa has the least number of speciation events and how many speciation events are there in total (the whole tree)?arrow_forwardExamine the graph below. Considering that the plants with the most trichomes were selected to produce seeds in the parent population, which of the following results would you predict for the next generation? (The x-axis indicates the number of trichomes.)arrow_forwardUse the following tree to answer the question below. A в с B C DEF G Which of the following trees, if any, depicts the same relationship among species as shown above? G F E D CB A A BCD E F F GE D Carrow_forward
- Compare the forms of speciation that are slow to those that occur more rapidly. Make a list of the slow and fast forms. With regard to mechanisms of genetic change, what features do slow and rapid speciation have in common? What features are different?arrow_forwardTo explain: In terms of natural selection the reason why no new puriri trees in New Zealand are found.arrow_forwardYou are hoping to get an estimate of the number of birch trees in a local park. You have a satellite image of the park, and plan to use quadrat sampling to estimate the number of birch trees in the park. The park is 1000m by 1000m. Describe how you can set up your quadrat and how you would then use the data you collect to estimate the number of trees in the entire park. (Include a sample calculation).arrow_forward
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