Biology: Life on Earth with Physiology (11th Edition)
11th Edition
ISBN: 9780133923001
Author: Gerald Audesirk, Teresa Audesirk, Bruce E. Byers
Publisher: PEARSON
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Chapter 26.2, Problem 2CYL
Summary Introduction
To explain:
Why natural selection has favored the evolution of aggressive signals and displays dominance hierarchies and territoriality.
Introduction:
Natural selection occurs due to mutation, migration and genetic drift in a population. It leads to cause evolution. Natural selection is responsible for variation among species in a biological population. In this process, organisms that are adapted to changing environment tend to survive and reproduce successfully.
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Explain how sexual selection might lead to a)sexual dimorphism and b) members of one sex (usually male) having traits that do not enhance their survival
In the context of the runaway sexual selection hypothesis, what role does female mate choice play in the evolution of exaggerated traits in males?
Females ignore males with exaggerated traits in favor of other factors such as resources
Females display exaggerated traits themselves to attract males with similar traits
Females have no preference for males with exaggerated traits
Females actively select mates with these traits, leading to their exaggerated development
Which of the following statements about inter- and intra-sexual selection is FALSE?
O Males are typically the sex experiencing intrasexual selection because they are generally limited by access to mates, whereas females are generally limited by access to
resources.
Intersexual selection can explain the occurrence of extravagant display traits in males such as the ornate coloration in guppies.
Males competing against each other to aquire the best nuptual gift is an example of intrasexual selection.
O Either intersexual or intrasexual selection may occur within a population, but not both.
Chapter 26 Solutions
Biology: Life on Earth with Physiology (11th Edition)
Ch. 26.1 - Prob. 1CYLCh. 26.1 - Prob. 1TCCh. 26.1 - Prob. 2CYLCh. 26.1 - Prob. 3CYLCh. 26.2 - Prob. 1CYLCh. 26.2 - Prob. 2CYLCh. 26.3 - Prob. 1CYLCh. 26.3 - Prob. 2CYLCh. 26.3 - Prob. 3CYLCh. 26.4 - Does symmetry have a scent? In one study,...
Ch. 26.4 - compare the advantages and disadvantages of...Ch. 26.4 - Prob. 2CYLCh. 26.5 - Prob. 1CYLCh. 26.5 - Prob. 1TCCh. 26.5 - Prob. 2CYLCh. 26.5 - Prob. 2TCCh. 26.6 - Prob. 1CYLCh. 26.6 - Prob. 2CYLCh. 26.7 - list the advantages and disadvantages of living in...Ch. 26.7 - Prob. 2CYLCh. 26.8 - Is our perception of human beauty determined by...Ch. 26.8 - Is our perception of human beauty determined by...Ch. 26.8 - Prob. 1CYLCh. 26.8 - Prob. 1HYEWCh. 26.8 - Prob. 2CYLCh. 26.8 - Prob. 3CYLCh. 26 - Prob. 1ACCh. 26 - Prob. 1FIBCh. 26 - Prob. 1MCCh. 26 - Prob. 1RQCh. 26 - Prob. 2ACCh. 26 - Prob. 2FIBCh. 26 - The benefits to an individual of living in a...Ch. 26 - Prob. 2RQCh. 26 - Prob. 3ACCh. 26 - Prob. 3FIBCh. 26 - Prob. 3MCCh. 26 - Prob. 3RQCh. 26 - Prob. 4FIBCh. 26 - Prob. 4MCCh. 26 - Prob. 4RQCh. 26 - Prob. 5FIBCh. 26 - Prob. 5MCCh. 26 - Discuss the advantages and disadvantages of group...Ch. 26 - Prob. 6FIBCh. 26 - Prob. 6RQ
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- In the eclectus parrot (Eclectus roratus), mothers sometimes take parental favoritism to extreme lengths by killing their sons, but never their daughters (Heinsohn et al. 2011). Sex-specific infanticide occurs more often at nests that can be flooded during the rainy season. Sons spend longer in the nest than daughters. Link this factor to why it might be adaptive for a parent parrot to kill a son in a vulnerable nest occupied by offspring of both sexes. Don't write from any online source..arrow_forwardIntrasexual selection involves competition among one sex (typically males) for mating access to the other sex. Intersexual selection involves mate choice in which individuals from one sex (typically females) choose their mates from among individuals of the other sex. Imagine a group of males that is engaged in agonistic behavior, from which Male A emerges triumphant. Now imagine a female that is assessing all of the males that were involved in the fights, and chooses Male A. Explain why this situation shows how intrasexual and intersexual selection pressures are likely both at play in the trait selection.arrow_forwardEvolutionary biology What are 4 conditions in which natural selection favors altruistic behaviors in which the individual performs costly actions to benefit others?arrow_forward
- Using the concept of inclusive fitness (and kin selection), explain how altruistic behavior (e.g. where an individual protects for another, even at their own expense) can evolve by natural selection? Make sure to explain what inclusive fitness is. (remember the concentric circles on the slide)arrow_forwardAssume you are studying a species of slug where the eggs are fertilized and transferred to the male. As a result the male is not able to increase reproductive success by mating with multiple partners. Therefore which of the following about sexual selection in this species is not true? Females are more likely to develop traits that signal genetic quality to males. Females will be able to increase reproductive success with increased mating partners. Sexual selection in males will lead them to be choosy with what females they mate with. Sexual selection in males will lead them to mate indiscriminately when they find a female.arrow_forwardIdentify whether each of the following scenarios is most likely to result in stabilizing, disruptive, or directional selection a) Beetles that emerge from hibernation too early are more likely to killed by frost, those that emerge too late will miss the chance to mate [Select ] b) Frogs with mating calls that are between 400 and 600 chirps per minute attract more mates than frogs with calls that are lower than 400 chirps per minute or greater than 600 chirps per minute [ Select ] c) Plants with the largest leaves are better able to gather sunlight in the rainforest [ Select ] d) Giraffes with longer necks can reach more leaves, but they have a harder time pumping blood from their heart up to their brain [Select] e) Mice with the lighter fur are better camouflaged from predators than mice with darker fur V [ Select ] stabilizing selection disruptive selection directional selectionarrow_forward
- Describe how courtship behavior drives sexual selection. Use the peacock as an example.arrow_forwardEarlier explanations of altruistic behavior as a form of group selec-tion have been supplanted by Hamilton’s hypothesis of kin selection. What distinguishes kin selection and how does it accord with the no-tion of inclusive fitness, the relative number of an individual’s alleles that pass to the next generation?arrow_forwardSexual selection tends to cause bigger size,more elaborate weaponry, or brighter colors in males. Is this an example of stabilizing,directional, or disruptive selection?arrow_forward
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