BIOLOGY:THE ESSENTIALS (LL) W/CONNECT
3rd Edition
ISBN: 9781260670929
Author: Hoefnagels
Publisher: MCG CUSTOM
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Chapter 30, Problem 18WIO
Some newborn mammals can walk and carry out other life functions independently. Human babies, on the other hand, are born helpless. Speculate about the trade-offs in these two reproductive strategies. What selective forces might limit the stage of development at which humans are born?
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Female mammals undergo continuous reproductive cycles during their reproductive life. In the sense of offspring production, what is the benefit of these continuous cycles?
Mate 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?
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In species with internal fertilization, the eggs often are attached to the outside of the female's body in brood chambers following copulation, before hatching into free-swimming offspring. What advantages might a brood chamber offer for the development of offspring?
Chapter 30 Solutions
BIOLOGY:THE ESSENTIALS (LL) W/CONNECT
Ch. 30.1 - Prob. 1MCCh. 30.1 - How is internal fertilization different from...Ch. 30.1 - Prob. 3MCCh. 30.1 - Prob. 4MCCh. 30.2 - What are the relationships among gonads, germ...Ch. 30.2 - Prob. 2MCCh. 30.2 - Prob. 3MCCh. 30.2 - Prob. 4MCCh. 30.2 - Prob. 5MCCh. 30.2 - Prob. 6MC
Ch. 30.3 - Prob. 1MCCh. 30.3 - Where do egg cells develop?Ch. 30.3 - What are the stages of oogenesis?Ch. 30.3 - Prob. 4MCCh. 30.3 - Prob. 5MCCh. 30.3 - Prob. 6MCCh. 30.4 - Describe how three birth control methods work.Ch. 30.4 - Prob. 2MCCh. 30.4 - Describe two reasons that a symptomless STI can be...Ch. 30.5 - Prob. 1MCCh. 30.5 - Prob. 2MCCh. 30.5 - Prob. 3MCCh. 30.5 - Prob. 4MCCh. 30.5 - Prob. 5MCCh. 30.5 - Prob. 6MCCh. 30.5 - Prob. 7MCCh. 30 - Unchanging environments are advantageous to...Ch. 30 - Prob. 2MCQCh. 30 - Prob. 3MCQCh. 30 - Prob. 4MCQCh. 30 - Prob. 5MCQCh. 30 - Prob. 6MCQCh. 30 - Prob. 7MCQCh. 30 - Prob. 8MCQCh. 30 - The umbilical cords function is to a. Transport...Ch. 30 - Prob. 10MCQCh. 30 - Prob. 1WIOCh. 30 - Prob. 2WIOCh. 30 - Prob. 3WIOCh. 30 - Prob. 4WIOCh. 30 - Prob. 5WIOCh. 30 - Prob. 6WIOCh. 30 - Prob. 7WIOCh. 30 - Prob. 8WIOCh. 30 - Prob. 9WIOCh. 30 - Prob. 10WIOCh. 30 - Prob. 11WIOCh. 30 - Prob. 12WIOCh. 30 - Prob. 13WIOCh. 30 - Prob. 14WIOCh. 30 - Prob. 15WIOCh. 30 - Prob. 16WIOCh. 30 - Prob. 17WIOCh. 30 - Some newborn mammals can walk and carry out other...Ch. 30 - Prob. 19WIOCh. 30 - Prob. 1SLCh. 30 - Review Why We Care 30.1 What kinds of studies and...Ch. 30 - Prob. 1PITCh. 30 - Prob. 2PITCh. 30 - Prob. 3PIT
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- Describe the step-by-step fertilization process in an amphibian. (Please include the structures involved in the process.)arrow_forwardMammals have unique reproductive adaptations that have contributed to their evolutionary success. One of the distinguishing characteristics of mammals is their mammary glands, which allow for the production of milk. Even the more primitive mammals, such as the duck-billed platypus and the kangaroo, have some type of mammary glands. However, only the placental mammals (e.g. humans, horses, dogs) have a placenta, which supports the internal development of the embryo. The most primitive mammals have no placenta and can’t support the internal development of the embryo. Describe one function of the placenta found in mammals such as humans, horses, and dogs.arrow_forwardMammals have unique reproductive adaptations that have contributed to their evolutionary success. One of the distinguishing characteristics of mammals is their mammary glands, which allow for the production of milk. Even the more primitive mammals, such as the duck-billed platypus and the kangaroo, have some type of mammary glands. However, only the placental mammals (e.g. humans, horses, dogs) have a placenta, which supports the internal development of the embryo. The most primitive mammals have no placenta and can’t support the internal development of the embryo. Describe one advantage for an offspring to develop internally as opposed to developing externally (this means inside vs. outside the female’s womb/body)arrow_forward
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