<LCPO> BIOLOGY
12th Edition
ISBN: 9781266216398
Author: Raven
Publisher: MCG CUSTOM
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Textbook Question
Chapter 22, Problem 3U
Problems with the biological species concept include the fact that
a. many species reproduce asexually.
b. postzygotic isolating mechanisms decrease hybrid viability.
c. prezygotic isolating mechanisms are extremely rare.
d. All of the choices are correct.
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Students have asked these similar questions
Members of two separate species mate and produce hybrid offspring that fail to thrive in the environment. The hybrid genotypes do not suit the hybrid organism for survival using any given niche. Eventually, the hybrid genotypes disappear from the environment. This would be due to:
A. hybrid inviability
B. hybrid sterility
C. gametic incompatibility
D. pre-zygotic isolation
E. infra-gametic disruption
1. Sea urchins are broadcast spawners that release clouds of sperm/eggs into the water column. However, the
ability to successfully fertilize the egg by the sperm is restricted to very specific gametic proteins that inhibit
cross species fertilization. This is an example of a
a. Post zygotic barrier b.Habitat isolation c.Mechanical isolation d.Pre zygotic barrier e.Hybrid breakdown
2) In some Drosophila species, conditions in the female reproductive tract do not allow the sperm of other species to survive long enough for fertilization to occur. What mechanism of reproductive isolation is in operation in this example?
a.Temporal isolation.
b.Mechanical isolation.
c.Low hybrid viability.
d.Gametic isolation.
Chapter 22 Solutions
<LCPO> BIOLOGY
Ch. 22.1 - Understand the biological species concept and why...Ch. 22.1 - Define the two kinds of reproductive isolating...Ch. 22.1 - Describe the relationship of reproductive...Ch. 22.2 - Prob. 1LOCh. 22.2 - Prob. 2LOCh. 22.3 - Prob. 1LOCh. 22.3 - Prob. 2LOCh. 22.4 - Compare and contrast sympatric and allopatric...Ch. 22.4 - Prob. 2LOCh. 22.5 - Prob. 1LO
Ch. 22.5 - Prob. 2LOCh. 22.6 - Prob. 1LOCh. 22.6 - Prob. 2LOCh. 22.7 - Prob. 1LOCh. 22.7 - Prob. 2LOCh. 22 - Prob. 1IQCh. 22 - Prob. 2IQCh. 22 - Prezygotic isolating mechanisms include all of the...Ch. 22 - Reproductive isolation is a. a result of...Ch. 22 - Problems with the biological species concept...Ch. 22 - Prob. 4UCh. 22 - Prob. 5UCh. 22 - Prezygotic isolation a. always involves mechanisms...Ch. 22 - Speciation by allopolyploidy a. takes a long time....Ch. 22 - Adaptive radiation a. is the result of enriched...Ch. 22 - Prob. 9UCh. 22 - Character displacement a. arises through...Ch. 22 - Prob. 11UCh. 22 - If reinforcement is weak and hybrids are not...Ch. 22 - Natural selection can a. enhance the probability...Ch. 22 - Hybridization between incompletely isolated...Ch. 22 - Natural selection can lead to speciation a. by...Ch. 22 - Natural selection can lead to the evolution of...Ch. 22 - Prob. 2SCh. 22 - Refer to figure 22 6 In Texas. Drummond s phlox is...Ch. 22 - Refer to figure 22.16. Geospiza fuliginosa and...
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- Which of the following would be a good example of premating reproductive isolation? A. Cross-fertilizations between the gray treefrogs, Hyla versicolor and H. chrysoscelis result in a high degree of mortality prior to hatching of hybrid eggs. B. The mule, a hybrid between horses and donkeys is viable, but sterile. C. Males of H. versicolor produce an advertisement call with a much slower pulse rate than males of H. chrysoscelis and females use pulse rate differences to avoid mating with the wrong species. D. Hybrid offspring are produced from matings between leopard frogs and green frogs, but usually die before the tadpoles metamorphose into froglets.arrow_forwardIf reinforcement is weak and hybrids are not completely infertile, a. genetic divergence between populations may be overcome by gene flow. b. speciation will occur 100% of the time. c. gene flow between populations will be impossible. d. the speciation will be more likely than if hybrids were completely infertile.arrow_forward5a) It is generally considered that blue or purplish colored flowers attract bees as pollinators. Red flowers often attract birds such as hummingbirds as pollinators. Is this an example of prezygotic or postzygotic isolating mechanisms? Why? 5b) The graphs in your textbook show that the parental species are partially isolated by living at somewhat different altitudes in the mountains. In nature, the two parental species are also strongly (but not completely) isolated by using different pollinators (bees vs. hummingbirds). Is the presence of altitudinal separation combined with different pollinators likely to give more reproductive isolation in nature compared to each isolating mechanism alone? Why? 5c) Do the figures showing the F2 generation of the flowers suggest that these traits of flower shape and flower color are polygenic or due to single gene loci? Give a reason for your answer. 5d) Looking at the other graphs for this example that are shown in your textbook, is there any…arrow_forward
- You are studying foxes in a national park that has a large lake. You find four populations with different paw colors (shown below) and note their mating habits and hybridization tendencies. Which of the following describes your findings correctly? A The different populations of Red Fox are affected by temporal isolation. B The offspring in the hybrid zones are affected by hybrid inviability. C The fox populations can be considered a ring species. D The fox populations can be considered an adaptive radiation. E The fox populations are affected by vicariance isolation. Northern: Black paws No hybrids Narrow hybrid zone: Dark gray paws Western: Brown paws Eastern: Gray paws Lake Narrow hybrid zone: Tan paws Narrow hybrid zone: Light gray paws Southerm: White pawsarrow_forward1. The North American garter snake (Thamnophis) has a number of sympatric populations that can be either terrestrial or aquatic. Terrestrial populations generally do not interbreed with aquatic populations, despite living in sympatry, because they are most likely separated by which pre-zygotic barrier? A. allopatric isolation by means of vicariance B. gamete isolation C. mechanical isolation D. habitat isolation E. allopatric isolation by means of dispersalarrow_forwardIdentify the most accurate statement about population variation. a. Allopolyploidy occurs when chromosomes fail to separate during gametogenesis and then self-fertilization results in a tetraploid offspring. b. Chromosomal duplications and deletions cause large changes due to the changes in gene dosage. c. Traits that are influenced by both environment and genetics are unlikely to be influenced by evolution. d. Gene duplications and deletions occur frequently during equal crossing over that occurs during meiosis I.arrow_forward
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