Biology
4th Edition
ISBN: 9781259188121
Author: Peter Stiling, Robert Brooker, Linda Graham, Eric Widmaier
Publisher: McGraw-Hill Education
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Chapter 24.3, Problem 1CC
Summary Introduction
To determine: Whether the trait of having loud and elaborate courtship in male birds is involved in intersexual or intrasexual selection.
Introduction: In an intrasexual selection, males directly compete with each other to mate with of the opposite sex. In intersexual selection, members of one sex, usually the females choose their mates on the basis of certain types of desirable characteristics.
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Chapter 24 Solutions
Biology
Ch. 24.1 - Prob. 1CCCh. 24.2 - Prob. 1CCCh. 24.2 - Prob. 2CCCh. 24.2 - Prob. 3CCCh. 24.3 - Prob. 1CCCh. 24.3 - Prob. 1EQCh. 24.3 - Prob. 2EQCh. 24.3 - Prob. 3EQCh. 24.4 - Genetic Drift Concept Check: How does the...Ch. 24.4 - Prob. 1BC
Ch. 24.5 - Prob. 1CCCh. 24.5 - Prob. 1BCCh. 24 - Population geneticists are interested in the...Ch. 24 - The Hardy-Weinberg equation characterizes the...Ch. 24 - Prob. 3TYCh. 24 - Prob. 4TYCh. 24 - Prob. 5TYCh. 24 - Prob. 6TYCh. 24 - Prob. 7TYCh. 24 - Prob. 8TYCh. 24 - Kimuras proposal regarding neutral variation...Ch. 24 - Populations that experience inbreeding may also...Ch. 24 - Prob. 1CQCh. 24 - Prob. 2CQCh. 24 - Prob. 3CQCh. 24 - Antibiotics are commonly used to combat bacterial...Ch. 24 - Discuss die similarities and differences among...
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- Selection may also act against heterozygotes. How do allele frequencies change if the two homozygotes have unequal fitness, but heterozgotes have a constant 50% reduced fitness? Simulate allele frequency changes with multiple values of p0 (between 0 and 1). can you explain what happens and whyarrow_forwardPrezygotic Isolating Mechanisms: Behavioral isolation canprevent individuals of different species from mating. Explorehow sexual selection contributes to behavioral reproductiveisolation. Explain your answer in a well defined manner.arrow_forwardMeasuring Genetic Diversity in Human Populations Why is it that mutation, acting alone, has little effect on gene frequency?arrow_forward
- Kin Selection - Ground squirrels will often give a warning call when they see a predator, altering the other ground squirrels to the danger. Calling behavior draws attention to the calling squirrel. This being the case, why would natural selection favor this altruistic behavior? Consider this - female squirrels are 70% more likely to make a warning call than male squirrels. Also consider, male squirrels leave the colony when they reach maturity, while female squirrels stay in the colony they are born in. Explain how natural selection is working here!arrow_forwardRecall how Anolis carolinensis species on several islands off the Florida coast adapted to the arrival if invasive A. sagrei by growing bigger toepads, for easier climbing higher up in trees. Suppose an allele increasing topead size was intiially present at a frequency of 0.05. How much would it have to increase fitness in order to reach a frequency of at least 0.9 within 10 generations?arrow_forwardDrift acting independantly in reproductively isolated populations does it increase or decrease the differences between populations?arrow_forward
- Question- Bluegill sunfish males use one of three strategies in trying to gain access to females and mate. Each male only carries out only one of the three strategies: territorial male, sneaker male or female mimic. While the territorial males have the highest reproductive success relative to the other males, some males are not large enough to successfully compete with other territorial males and adopt an alternative strategy, where they gain at least some reproductive success. This is an example of option 1-artificial selectionoption 2-balanced polymorphismOption 3-stabilizing selectionOption 4-negative-frequency dependent selectionarrow_forwardSelection may also act against heterozygotes. How do allele frequencies change if the two homozygotes have equal fitness, but heterozgotes have a 50% reduced fitness? Explain what happens and whyarrow_forwardQuestion: Human hunting of bighorn sheep has focused on ‘trophy’ sheep which are the largest male sheep with the longest horns. Consequently, over the last 30 years of hunting pressure, average weight of male sheep has declined by ~20 kilograms and average horn length has declined by ~25 centimeters. These changes are evidence of _________ selection. A- Stabilizing B- Diversifying/Disruptive C- Directional D- There is no evidence of selection in this systemarrow_forward
- a study to assess the strength of selection on alleles of a gene “B” which affects brightness of the bioluminescence in fireflies. Fireflies with the brightest light (genotype BB), have an average of 5 offspring. Fireflies with the dimmest light (genotype bb), have an average of 20 offspring. Fireflies with an intermediately bright light (genotype Bb), have an average of 25 offspring. What is the fitness of… BB = Bb = bb = For which genotype would selection be strongest?arrow_forwardmating population of chickens, 16 percent of the herd have green wattles (those neck flaps). Green is the autosomalrecessive (r) and 84 percent have Yellow wattles (R, the wildtype) If this population is assumed to be in Hardy-Weinberg equilibrium, what is the genotypic frequencies of RR and Rr?What is the genotypic frequency of RR? Leave answers as 2 decimalsarrow_forwardINTERPRET DATA Compare the two graphs in Figure 1-17. What information does the second graph illustrate? What possible explanation can you give for the differences shown in the two graphs? (a) Number of chimpanzees who successfully employed specific method of tool use. (b) Number of chimpanzees who successfully employed learned method of tool use two months later. Figure 1-17 An experiment testing learning in chimpanzee populations In the photo, wild chimpanzees are shown observing a member of their group using a tool.arrow_forward
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