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Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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In the animal kingdom, only primates menstruate. Other mammals
come into season, or “heat,” during certain times of the year, while
still others only ovulate after having sex. What would be some
possible advantages of a monthly menstrual cycle?
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- Name some organsims which practice asexual reproduction.arrow_forwardMeiosis in spermatogonia begins After the first ejaculation At puberty During early child hood At birth In the embryoarrow_forwardFemale mammals undergo continuous reproductive cycles during their reproductive life. In the sense of offspring production, what is the benefit of these continuous cycles?arrow_forward
- Briefly compare and contrasts the advantage of asexual and sexual reproduction. Which one is most common in animals?arrow_forward|(A) Humans have some rather unique features to our reproductive behavior. One strange one, relative to other animals, is female menopause. What might be the selective advantage to this feature? (B) What selective forces may have led to the evolution of menopause in humans?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_forward
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