Campbell Biology (11th Edition)
11th Edition
ISBN: 9780134093413
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece
Publisher: PEARSON
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Textbook Question
Chapter 51, Problem 9TYU
SCIENTIFIC INQUIRY Scientists studying scrub jays found that “helpers” often assist mated pairs of birds by gathering food for their offspring.
(A) Propose a hypothesis to explain what advantage there might be for the helpers to engage in this behavior instead of seeking their own territories and mates.
(B) Explain how you would test your hypothesis. If it is correct, what results would you expect your tests to yield?
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. SCIENTIFIC INQUIRY Scientists studying scrub jays found that“helpers” often assist mated pairs of birds by gathering food fortheir offspring.(A) Propose a hypothesis to explain what advantage theremight be for the helpers to engage in this behavior insteadof seeking their own territories and mates.(B) Explain how you would test your hypothesis. If it is correct,what results would you expect your tests to yield?
How would self-sacrifice of male redback spiders be an adaptive behaviour?
Select one:
a.
When males meet a female and self-sacrifice, it activates enzymes that make
his sperm more fit and able to fertilize more eggs.
b. Males are able to mate with one female, then mate with another female
nearby, before being devoured by the first female.
C.
Males only use self-sacrificing behaviour once they have mated with several
females and have exhausted their sperm supplies.
d. The chance of a male meeting more than one female is quite low; self-sacrifice
maximizes mating time with and sperm transfer to any female the male finds.
(A) Define Eusocial behavior. (B) What is it about the mating system of Eusocial
hymenoptera that Hamilton used to explain the evolution of Eusocial behavior in
this insect group? (C) Eusocial behavior has evolved in non-hymenoptera. The
explanation depends on unique features of the ecology of these organisms. What
might these be? (D) Use the Florida scrub jay, sponge shrimp or naked mole rat to
explain your answer.
Chapter 51 Solutions
Campbell Biology (11th Edition)
Ch. 51.1 - If an egg rolls out of the nest, a mother greylag...Ch. 51.1 - WHAT IF? Suppose you exposed various fish species...Ch. 51.1 - MAKE CONNECTIONS How is the lunar-linked rhythm...Ch. 51.2 - How might associative learning explain why...Ch. 51.2 - Prob. 2CCCh. 51.2 - Prob. 3CCCh. 51.3 - Why does the mode of fertilization correlate with...Ch. 51.3 - MAKE CONNECTIONS Balancing selection can maintain...Ch. 51.3 - WHAT IF? Suppose an infection in a common...Ch. 51.4 - Prob. 1CC
Ch. 51.4 - Prob. 2CCCh. 51.4 - Prob. 3CCCh. 51 - How is migration based on circannual rhythms...Ch. 51 - Prob. 51.2CRCh. 51 - In some spider species, the female eats the male...Ch. 51 - Prob. 51.4CRCh. 51 - Prob. 1TYUCh. 51 - Prob. 2TYUCh. 51 - Female spotted sandpipers aggressively court males...Ch. 51 - Prob. 4TYUCh. 51 - Although many chimpanzees live in environments...Ch. 51 - Prob. 6TYUCh. 51 - Level 3: Synthesis/Evaluation 7. DRAW IT You are...Ch. 51 - EVOLUTION CONNECTION We often explain our behavior...Ch. 51 - SCIENTIFIC INQUIRY Scientists studying scrub jays...Ch. 51 - SCIENCE, TECHNOLOGY, AND SOCIETY Researchers are...Ch. 51 - WRITE ABOUT A THEME: INFORMATION Learning is...Ch. 51 - SYNTHESIZE YOUR KNOWLEDGE Acorn woodpeckers...
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- You want to distinguish between two hypotheses to explain the patterns you see: 1) Males not feeding the young is an adaptation to dimorphism 2) If males don't feed the young in a species, it will allow them to become brightly colored To begin to address this question, map the characters changes in dimorphism and males feeding the young onto each of the trees on the previous page. CHARACTER SEXUAL DIMORPHISM MALES FEED YOUNG Cassin's Vireo No No Red Fox Sparrow Cape May Warbler Cedar Waxwing Golden-Crowned Kinglet Pyrrhuloxia Yes No No No No Yes No Yes Yes No California Gull No Yes Note: This data is fictional 5) Which of the hypotheses in part 4 is consistent with your analysis? Explain why in a brief paragraph.arrow_forwardIn your own words (please discuss properly) Are social insects better able to modify the environment than solitary species? Explain. Cite concrete evidence to prove your point.arrow_forwardOne of Darwin’s finches, the medium ground finch (Geospiza fortis), is found on the small island of Daphne Major. These finches are seedeating birds. A major drought occurred on the island in 1977. Following the drought, the average beak size of medium ground finches had increased about 3%–4%. Why might a drought lead to an evolutionary change in beak size? Propose a hypothesis and explain how you could go about testing it.arrow_forward
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