Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 24, Problem 2COQ
Discuss the type of
- a. A pregnant female rat is transported by an ocean liner to a new continent.
- b. A meadow containing several species of grasses is exposed to a pesticide that promotes nondisjunction.
- c. In a very large lake containing several species of fishes, the water level gradually falls over the course of several years. Eventually, the large lake becomes subdivided into smaller lakes, some of which are connected by narrow streams.
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Explain the type of speciation (allopatric, parapatric, or sympatric) most likely to occur under each of the following conditions:
A. A pregnant female rat is transported by an ocean liner to a new continent.
B. A meadow containing several species of grasses is exposed to a pesticide that promotes nondisjunction.
C. In a very large lake containing several species of fish, the water level gradually falls over the course of several years. Eventually, the large lake becomes subdivided into smaller lakes, some of which are connected by narrow streams.
a. What are the various types of reproductive isolating mechanisms that can lead to speciation?
b. What are the different modes of speciation?
c. Explain how evolution produce the tremendous amount of diversity among organisms.
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?
Chapter 24 Solutions
Biology
Ch. 24.1 - Can you think of another example of two different...Ch. 24.1 - Prob. 1CSCh. 24.1 - Is temporal isolation an example of a prezygotic...Ch. 24.1 - Prob. 3CCCh. 24.2 - Prob. 1CSCh. 24.2 - Prob. 1EQCh. 24.2 - Prob. 2EQCh. 24.2 - Prob. 3EQCh. 24.2 - Prob. 1CCCh. 24.2 - Prob. 2CC
Ch. 24.4 - Evo-Devo: Evolutionary Developmental Biology...Ch. 24.4 - Prob. 1CSCh. 24.4 - Prob. 2CCCh. 24 - Macroevolution refers to evolutionary changes that...Ch. 24 - Prob. 2TYCh. 24 - Prob. 3TYCh. 24 - Prob. 4TYCh. 24 - Prob. 5TYCh. 24 - Prob. 6TYCh. 24 - Prob. 7TYCh. 24 - Prob. 8TYCh. 24 - Prob. 9TYCh. 24 - Prob. 10TYCh. 24 - What is the key difference between prezygotic and...Ch. 24 - What are the key differences between gradualism...Ch. 24 - Prob. 3CQCh. 24 - Prob. 1COQCh. 24 - Discuss the type of speciation (allopatric or...
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- Indicate the order in which the following steps would take place to result in Parapatric Speciation [enter 1 for the first step, 2 for the second, etc; write only the number -- no words, no spaces] Something happens so that the environment is different in one part of the range relative to the other, even though the populations are still contiguous. As they adapt to their specific environments, the fitness of any hybrid formed is reduced. The populations adapt to their environment in the part of the range where they live. Interbreeding populations connected via gene flow occur across a range. Reproductive isolating mechanisms are selected for so that less fit hybrids are not formed. Two species now exist.arrow_forwardIs allopatric speciation more likely to occur on an island close to the mainland or on a more isolated island of the same size? Explain.arrow_forwardAll of the following are examples of prezygotic isolation except? A.) Two closely related species of flowering plants that release and are receptive to pollen at different times B.) Two closely related species of squirrels, one that lives and breeds in woody meadows and another that lives and breeds in the forest interior C.) Two closely related species of song birds whose hybrid embryos die early in development D.) Two closely related species of spiders that have different, species specific, binding proteins on their gametesarrow_forward
- Is allopatric speciation more likely to occur on an island close to the mainland or on a more isolated island of the same size? Justify your prediction.arrow_forwardIs allopatric speciation more likely to occur on an island close to a mainland or on a more isolated island of the same size? Explain your prediction.arrow_forwardWhat is the phylogenetic definition of a species? A) A group of individuals that can breed and produce viable offspring B) A group of interbreeding individuals that share the same environment C) A group of individuals that share a common ancestorarrow_forward
- Two hundred years ago, the fly species Rhagoletis pomonella only laid its eggs on fruit of the hawthorn tree. Today, different "host races" of R. pomonella lay their eggs on hawthorns OR apples. Apples occur within the range of hawthorns, so divergence between apple flies and hawthorn flies could be the first step in sympatric speciation. Choose the evidence that would suggest that R. pomonella is currently undergoing sympatric speciation. Check ALL answers that apply. A. Apple flies and hawthorn flies are able to form fertile hybrids. B. Apple flies and hawthorn flies are physically indistinguishable from each other. C. Apple flies typically mate with apple flies, and hawthorn flies typically mate with hawthorn flies. D. Apple flies and hawthorn flies emerge from their hosts at different times of the year.arrow_forwardWhich of the following factors would not contribute toallopatric speciation?(A) The separated population is small, and genetic drift occurs.(B) The isolated population is exposed to different selectionpressures than the ancestral population.(C) Different mutations begin to distinguish the gene pools ofthe separated populations.(D) Gene flow between the two populations is extensive.arrow_forwardCan speciation occur without complete physical separation of populations?arrow_forward
- Which of the following may be true of two species that are a result of allopatric speciation? Select all that apply. a They will be genotypically similar. b They will be phenotypically similar. c They can produce viable offspring. d They will be geographically isolated.arrow_forwardWould each of the following examples of reproductive isolation be considered a prezygotic or postzygotic mechanism? A. Horses and donkeys can interbreed to produce mules, but the mules are infertile. B. Three species of the orchid genus Dendrobium produce flowers 8 days, 9 days, and 11 days after a rainstorm. The flowers remain open for 1 day. C. Two species of fish release sperm and eggs into seawater at the same time, but the sperm of one species do not fertilize the eggs of the other species. D. Two tree frogs, Hyla chrysoscelis (diploid) and Hyla versicolor (tetraploid), can produce viable offspring, but the offspring are sterile.arrow_forwardWhat is speciation? List any two events that lead to speciation?arrow_forward
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