WHAT IS LIFE ACHIEVE ACCESS ONLY >I<
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ISBN: 9781319487317
Author: PHELAN
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Chapter 26, Problem 3SA
Summary Introduction
To review:
The adaptations that occur due to sperm competition.
Introduction:
When the female is likely to mate with many males, one male's sperms need to outcompete those of the others.
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Chapter 26 Solutions
WHAT IS LIFE ACHIEVE ACCESS ONLY >I<
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- Highlight the features and characteristics of both the Male and Female reproductive systems by preparing a paradigm or a concept map that will make contrasting features for both systems.arrow_forwardWhat is the adaptive significance of having sperm and egg produced at different times?arrow_forwardDescribe the three manners in which fertilization of human ovum by sperm can be prevented?arrow_forward
- All of the following are correct about asexual reproduction EXCEPT a) it can create numerous offspring quickly b) the offspring are genetically identical to the parent c) it enables animals living in isolation to produce without a mate d) it is advantageous when the environment is changing and the organisms is stressed.arrow_forwardWhat happens during each of the four phases of the human sexual response?arrow_forwardWhich of the following statements about reproduction in humans is correct? (a) Fertilisation takes place externally. (b) Fertilisation takes place in the testes. (c) During fertilisation egg moves towards the sperm. (d) Fertilisation takes place in the human female.arrow_forward
- Give account of events that occur following mating and before the onset of cleavage in mammalsarrow_forwardName two sets of structures that are homologous between the male and female reproductive systems.arrow_forwardIn 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_forward
- Describe the added “costs” of sexual reproduction for an organism.arrow_forwardMate guarding is an evolved response to sperm competition. Chimpanzee (Pan troglodytes) females regularly mate with several males in the same estrous cycle, whereas gorilla (Gorilla gorilla) females almost never do, since they typically live in bands, each controlled by a single, powerful male. How large (as a proportion of body size) should the testes of chimpanzee males be relative to gorilla testes (Harcourt et al. 1981)? If the testes of men are more similar to those of chimpanzees, what would this tell us about the intensity of sperm competition during our evolutionary past? If, on the other hand, human testes resemble those of gorillas, what conclusion is justified? Please don't write from any online source.arrow_forwardAs described in the Biology and Society section, some species (including some endangered species) have been shown to be capable of reproduction via parthenogenesis, without participation of a mate. What implications might this have on efforts to repopulate endangered species? What drawbacks might a parthenogenesis program have on the well-being of the species it targets?arrow_forward
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