15. In geladas, a primate that lives in the highlands of Ethiopia, pregnant females terminate pregnancies in the weeks after an alpha male takeover. Explain why natural selection might favor this behavior.
Added by Charles F.
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Step 1: State the observation — after an alpha male takeover in gelada groups, many pregnant females spontaneously terminate their pregnancies in the following weeks. Show more…
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Some nonhuman primate species are well known for a history of male infanticide. When a new male takes over a group of females, he intentionally kills the infants who are still depending on their mother’s milk. Why is this seen as beneficial to the incoming male (not the infants or the females)? a. The male can assert his dominance over the females and will not have to deal with females acting against his wishes as long as he is in charge of the group. b. The male is controlling population size to ensure that the group will not run out of food resources. c. The females will not get pregnant while nursing an offspring, so this behavior allows the male to reproduce with those females sooner; therefore, increase his own reproductive success. d. Infants are obnoxious and messy. In coming males do not want deal with them.
Luke H.
5. (200-300) From chpt. 6 Explain how infanticide (the killing of an infant) evolved through sexual selection among some animals like langur monkeys. Hint: this is a question about an adaptation, so it’s fundamentally a question of how infanticide serves the reproductive interests of the killer. Notice too, of course, that it’s not the killing of one’s own infant, but rather the strategic killing of certain conspecifics’ (look up this word if you don’t know it) infants.
Adi S.
A female chimpanzee engages in sex only during her fertile period, which is advertised by a swelling of her external genitals. Bonobos, the closest relatives of the chimpanzees, are more sexually active than chimpanzees. Female bonobos mate even when they are not fertile. In both species, mating is promiscuous; each female mates with many males. By one hypothesis, female promiscuity may help prevent male infanticide. Chimpanzee male have been observed to kill infants in the wild, but this behavior has never been observed among bonobos. Explain why it would be disadvantageous for a male to kill the infant of a female with whom he had sex. How the bonobos female might's increased sexual activity lower likelihood of male infanticide still further?
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