BIOLOGY
12th Edition
ISBN: 9781260169614
Author: Raven
Publisher: RENT MCG
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Chapter 21, Problem 1A
In Darwin’s finches,
a. occurrence of wet and dry years preserves
b. increasing beak size over time proves that beak size is inherited.
c. large beak size is always favored.
d. All of the choices are correct.
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Students have asked these similar questions
In Darwin’s finches,
a. occurrence of wet and dry years preserves genetic variation for beak size.
b. increasing beak size over time proves that beak size is inherited.
c. large beak size is always favored.
d. All of the choices are correct.
Which statement is correct, based on current evolutionary theory?
a.
Selection will favor alleles only if they are good for the species.
b.
Selection will favor alleles only if, on average, they increase the reproductive success of individuals who have them.
c.
In small populations genetic drift can be more effective than natural selection in building adaptations.
d.
Selection sometimes favors alleles that systematically lower the reproductive success of the individuals who have them.
e.
Two of the above are correct.
Is sexual selection or natural selection the driver for the differences between males and females?
a. In the hollyhock weevil (Rhopalapion longirostre) the females a have much longer rostrum. The length of rostrum is correlated with offspring survival but not
mating frequency.
b. In the marine iguana species (Amblyrhynchus cristatus) on the islands near Ecuador the males often exceed expected size on a given island. Male size is
correlated with survival and number of mating events.
Chapter 21 Solutions
BIOLOGY
Ch. 21.1 - Prob. 1LOCh. 21.1 - Prob. 2LOCh. 21.2 - Prob. 1LOCh. 21.2 - Distinguish between demonstrating that evolution...Ch. 21.3 - Contrast the processes of artificial and natural...Ch. 21.3 - Prob. 2LOCh. 21.4 - Prob. 1LOCh. 21.4 - Prob. 2LOCh. 21.4 - Prob. 3LOCh. 21.5 - Explain the evolutionary significance of...
Ch. 21.5 - Prob. 2LOCh. 21.6 - Prob. 1LOCh. 21.6 - Prob. 2LOCh. 21.7 - Characterize the criticisms of evolutionary theory...Ch. 21.7 - Prob. 2LOCh. 21 - Suppose that a male with a beak depth of 10 mm...Ch. 21 - Prob. 1IQCh. 21 - Prob. 2IQCh. 21 - Prob. 3IQCh. 21 - Why might the evolutionary line leading to...Ch. 21 - Artificial selection is different from natural...Ch. 21 - Gaps in the fossil record a. demonstrate our...Ch. 21 - The evolution of modern horses (Equus) is best...Ch. 21 - Homologous structures a. are structures in two or...Ch. 21 - Convergent evolution a. is an example of...Ch. 21 - Prob. 6UCh. 21 - The possession of fine fur in 5-month human...Ch. 21 - In Darwins finches, a. occurrence of wet and dry...Ch. 21 - Prob. 2ACh. 21 - Convergent evolution is often seen among species...Ch. 21 - What conditions are necessary for evolution by...Ch. 21 - Explain how data shown in figure 21.2a and b...Ch. 21 - Prob. 3SCh. 21 - Refer to figure 21.5, artificial selection in the...Ch. 21 - The ancestor of horses was a small, many-toed...
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- The domestic dog belongs to the species Canis familiaris. The great dane, golden retriever, cocker spaniel, fox terrier and chihuahua are different breeds within this species. a List some differences between these breeds. b List some differences within one of these breeds. c Considering the differences in size between the largest and smallest of these breeds, explain how it is that they are all considered to belong to the same species.arrow_forwardThe good genes hypothesis is a theory that explains what? a. why more fit individuals are more likely to have more offspring b. why alleles that confer beneficial traits or behaviors are selected for by natural selection c. why some deleterious mutations are maintained in the population d. why individuals of one sex develop impressive ornamental traitsarrow_forwardDarwin's studies of Galapagos finches are well known in the study of evolution. These studies have been instrumental in helping us understand how new species evolved from pre-existing species. Which statement is true about the speciation of the Galapagos finches? Responses A The finches had different traits that influenced the environment in which they chose to live. The finches had different traits that influenced the environment in which they chose to live. - no response given B The finches evolved traits to help them survive in different environments. The finches evolved traits to help them survive in different environments. - no response given C Members of the original population evolved in such a way that it became impossible for individuals from the two new populations to interbreed. Members of the original population evolved in such a way that it became impossible for individuals from the two new populations to interbreed. - no response given D Genetic…arrow_forward
- Which of these events describes a trait of the rabbit that is MOST likely passed on to future generations? A A young rabbit develops a bacterial infection and lives long enough to produce three litters. B A young rabbit constantly outruns predators and lives long enough to produce three litters. C A young rabbit survives freezing winter temperatures and digs a burrow in the spring. D A young rabbit migrates to find a better food supply and establishes a new territory.arrow_forwardIt is believed that trichomes give an evolutionary advantage to plants when herbivory is high because the trichomes may be irritating to the animals that feed on these plants. In these situations, the selection pressure would favor plants with more trichomes. The experiment described above mimics this condition. What type of selection is represented here? A. Stabilizing B. Disruptive C. Directional selectionarrow_forwardIndividuals in a population of sunflowers have a range of flower sizes, and the average diameter of their flowers is 5 cm. What effect would selection have on flower diameter in this population of sunflowers? A. The average flower diameter may not change if the population is under disruptive selection. B. Small flowers are favoured if the population is under disruptive selection. C. The average flower diameter will increase if the population is under stabilizing selection. D. Large flowers are favoured if the allele for flower size is dominant when the population is under directional selection.arrow_forward
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