Biological Science
5th Edition
ISBN: 9780321743671
Author: Scott Freeman
Publisher: PEARSON
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Chapter 50, Problem 2TYK
Summary Introduction
Introduction:
The sperm competition refers to a competitive process where the spermatozoa of two or more different males compete to fertilize an egg during the process of sexual reproduction. This may occur when the female has more than one copulating partners.
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In seahorses, males incubate and care for offspring. Thus, the males are more likely to be tied up in reproduction at any point in time relative to females. Which sex do you predict will be the choosey sex in this species and why?
Males -- because fewer are available to mate
Males – because male-male competition is incredibly strong
Females – because sperm are cheap to produce
Female – because the operational sex ratio is biased in their favor
The sperm of chimpanzees have faster swimming speeds than those of gorillas. Based on what you know about sperm competition, what would you predict about differences between these two species in female re-mating frequency and sperm viability?
In chimps, females mate only once and sperm are viable for only a day
In chimps, females mate multiply and sperm live for a long time
In chimps, females mate only one, and sperm live for a long time
In chimps, females mate multiply, and sperm live for only a day
Which of the following sexual traits is…
Explain why hermaphroditism is a good solution to enjoy the
benefits of sex while also confronting the problem of finding a
mate in a sparse population.
Make guarding is a reproductive tactic that functions to directly: 
A. Increase the number of males to which a male has access.
B. Reduce the males paternity uncertainty.
C. Increase male reproductive output.
D. Reduce the females fitness. 

Chapter 50 Solutions
Biological Science
Ch. 50 - Prob. 1TYKCh. 50 - Prob. 2TYKCh. 50 - Prob. 3TYKCh. 50 - Prob. 6TYKCh. 50 - Prob. 4TYKCh. 50 - 8. Summarize the experimental evidence that...Ch. 50 - Prob. 5TYKCh. 50 - Prob. 7TYUCh. 50 - 8. Give examples of negative feedback and positive...Ch. 50 - Contrast spermatogenesis with oogenesis in humans....
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- Direct benefits derived by choosy females in mating include the following EXCEPT - A. Help in caring for young B. Nesting territories. C. Protection from injuries. D. Having more male offspring which be chosen as future mates.arrow_forwardMale cockroaches use their sense of smell to find food but also to detect receptive females. Discuss the anatomical, neural and molecular mechanisms that help males recognise mates over large distances and contrast them with the mechanisms that underpin the recognition of food by its smell.arrow_forwardIndividuals of some species of bony fishes change sex, some to maintain more males than females, others more females than males. What are the advantages and disadvantages of each situation? Are there any advantages and disadvantages in having an equal number of males and females?arrow_forward
- When the fitness increment of increased male function results in a small cost in fitness of female function, would a population evolve hermaphrodites?arrow_forwardWhy might a “monogamous” bird seek extra-pair copulations?arrow_forwardBased on the text for roaches: 1. Describe how the pest mates. 2. Describe the development of the offpring.arrow_forward
- 19. In this question and the next, pretend you are studying mating behaviors in a variety of voles, including prairie voles and montane voles. In both questions, use the diagram and graphs below when determining your answer. You are using the same behavioral assay described in class, which provides a measure of the amount of time spent in each of three chambers: a chamber with a previous sexual partner (Partner chamber), a neutral chamber with no other animal (Neutral chamber), and a chamber with an unfamiliar vole (Stranger chamber). Data is expressed as percentage of time spent in each of the three chambers. First, you decide to study the effects of vasopressin receptor blockers (antagonists) on mating behavior in male prairie voles. If you apply these drugs prior to all incidents of sexual behavior involving these voles, what do you expect to observe in your three-chamber assay? Select the letter corresponding to the graph that best matches your predictions.arrow_forwardAccording to the sexy son hypothesis, females select mates with extreme secondary sexual traits because they believe these traits will enhance what aspect of their offspring? Their health and vitality Their genetic quality Their attractiveness to future mates Their ability to escape predatorsarrow_forwardDo females select mates basedon traits indicative of “good genes”?arrow_forward
- In animal husbandary,if two closely related animals are mated for a few generation,it result in loss of fertility and vigour.why is this so?arrow_forwardThe Asian sea bass, a marine fish, changes sex during its lifetime. The sea bass breeds in large groups, with fish of both sexes "broadcast spawning" in the same area -- that is, they expel their gametes into the water rather than pairing off. There does not seem to be any male-male competition for mating rights. Females spawn several times per season and males may fertilize the eggs of multiple females. Do you think that the sea bass are protandrous or protogynous? Explain your answer in terms of the evolutionary advantages of the strategy. Edit View Insert Format Tools Tablearrow_forwardExplain why females should be choosier than males inselecting a matearrow_forward
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