Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Textbook Question
Chapter 45, Problem 29RQ
Why are polyandrous mating systems more rare than polygynous matings?
- Only males are capable of multiple rounds of reproduction within a single breeding season
- Only females care for the young
- Females usually experience more intrasexual selection pressure than males
- Females usually devote more energy to offspring production and development.
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Which of the following statements is NOT the reason why females are choosy?
By being choosy, she can acquire advantageous genotypes for her offspring from her mates.
By being choosy, she can acquire resource for her offspring from her mates.
By being choosy, she can ensure that her male offspring can attract more females as well.
Her seeming choosiness is a by-product of her stereotypical behaviors exploited by the males for mating gains.
All listed above are reasons why she is choosy
Male California sea lion mating success is determined by the number of mates they can acquire. Larger males are more successful at maintain larger territories. Females remain in one territory for the duration of the mating season and larger territories support more females than smaller territories. Additionally, the most successful males will fast during mating season to remain present in their territory at all times. If they leave to hunt they risk loss of their territory and access to all the females present in it. Which of the following best describes sexual selection in this species?
a.
Males likely engage in male-male combat to maintain territories.
b.
Intersexual selection is likely stronger than intrasexual selection.
c.
Sexual selection on the females is stronger than on the males.
d.
Females will mate with smaller males at a higher frequency than larger males
The major factor in determining which sex is likely to be subjected to sexual selection is the
body size
testis size
number of eggs
level of parental investment
All of the above
Chapter 45 Solutions
Biology 2e
Ch. 45 - Figure 45.2 As this graph shows, population...Ch. 45 - Figure 45.10b If the major food source of the...Ch. 45 - Figure 45.16 Age structure diagrams for rapidly...Ch. 45 - Which of the following methods will tell an...Ch. 45 - Which of the following is best at showing the life...Ch. 45 - Humans have which type of survivorship curve? Type...Ch. 45 - How is a clumped population distribution...Ch. 45 - Which of the following is associated with...Ch. 45 - Which of the following is associated with multiple...Ch. 45 - Which of the following is associated with the...
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- 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.arrow_forward6. All of the following statements about mating behavior are correct except: Intersexual selection describes females choosing males based on traits that indicate superior fitness compared to other males intrasexual selection results in selection for traits that help a male be superior in competition with other males the mating relationships of most birds appear monogamous from behavioral observations the mating relationships of most mammals are monogamous to ensure reproductive success of the pair polygamous relationships most often involve a single male and many females, but in some species that is reversed.arrow_forwardWhich of the following IS TRUE about sexual dimorphism (choose all that apply)? Group of answer choices it refers to morphological differences between the sexes it refers to the principles of selecting reproductive partners No answer text provided. in represents a form of intraspecific variationarrow_forward
- Why is long-term parental care not associated with having many offspring during a reproductive episode?arrow_forwardWhy mating system is associated with monomorphism, extensive paternal care, nuclear family groups, and pair-living residency? monogamy polygyny polyandry polygynandryarrow_forwardWhat are some other prezygotic reproductive barriers besides a mating dance?arrow_forward
- 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…arrow_forwardWhich mating system is associated with sexual dimorphism, bachelor groups, and infanticide committed by outsiders? Group of answer choices polygyny polygynandry monogamy polyandryarrow_forwardHigh testosterone is often associated with shorter lifespan in mammals. However, you find a new species of mouse in which males live longer than females under field conditions. Which of the possible explanations below would NOT predict this pattern? Male-male competition often injures the participants. Females suffer costs of reproduction caused by the burden of milk production. Males, but not females, provide territorial guarding that improves the survival of their grandchildren. Females enter menopause and stop reproducing at age five, while males can reproduce until death.arrow_forward
- What type of mating system developed in Round 1 without male parental involvement? Why? What type of mating system developed in Round 2 with male parental involvement? Why? If males and females had the same number of sperm, would the two rounds differ? howarrow_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_forwardThe conscious selection of a mate is called: Question 5 options: Monogamy Polygamy Nonrandom Mating Random Mating Question 6 (1 point) How does sonar affect some species' ability to hunt? Question 6 options: Sonar incorporates neither light nor sound. Sonar relies on light, rather than sound. Sonar relies on sound, rather than light. Sonar incorporates both light and sound. Question 7 (1 point) Which of the following species undergoes random mating? Question 7 options: Lions Marine Sponges Humans Tigers Question 8 (1 point) Which of the following associative behavior specifically refers to a relationship in…arrow_forward
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