WHAT IS LIFE? GDE.TO BIOLOGY W/PHYSIO.
5th Edition
ISBN: 9781319272531
Author: PHELAN
Publisher: MAC HIGHER
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Chapter 11, Problem 9MC
Summary Introduction
Introduction:
Sexual dimorphism is thought to have evolved due to male-male competition and the need to attract females.
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Which of these situations offers the lowest “opportunity for selection” for males?
A. Females choose mates with a fancy ornament.
B. Every female chooses one male to mate with for life.
C. Locations that females need access to in order to reproduce are rare.
D. Males fight each other for access to groups of females.
A new species is discovered in which males care for offspring after birth, and females leaves the nest immediately. In this species, males are likely to
A. Have more offsprings overall than females.
B. Have fewer offspring overall than females.
C. Be promiscuous.
D. Have lower parental investment.
Which of the following statements is a reason why females are usually the "choosier" sex?
A. They expend fewer resources in caring for their offspring.
B. They have higher potential fitness than males.
C. They have fewer opportunities to contribute offspring than males.
D. They directly compete with each other for mates.
Chapter 11 Solutions
WHAT IS LIFE? GDE.TO BIOLOGY W/PHYSIO.
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- The twofold cost of sex model by John Mynard Smith explains how - A. asexual females can become predominant in a population. B. anisogamy results in sexual reproduction. C. sexual individuals can produce genetically variant offspring. D. asexual females invest as much in offspring as the sexual females.arrow_forwardIn Biology of Beauty, Cowley found that contemporaryfemales are attracted to males with broad foreheads and strong chins, and that this effect persisted across different cultures. How did Cowley explain this result? A. This is a trick question- this attraction is culturally relative B. Males compete for access to females by developing these features as a form of male-male competition C. There is no evidence that females really are differentially attracted to males with these features D. Attraction to males with these features is adaptive for females because males with these traits are usually sexually mature and have healthy immune systems E. Only some human cultures value these traits as attractive.arrow_forwardA new species is discovered in which males care for offspring after birth, and females leave the nest immediately. In this species, males are likely to a. be promiscuous. b. have lower parental investment. c. have fewer offspring overall than females. d. have more offspring overall than females.arrow_forward
- Why are polyandrous mating systems more rare than polygynous matings? a. Only males are capable of multiple rounds of reproduction within a single breeding season. b. Only females care for the young. c. Females usually experience more intrasexual selection pressure than males. d. Females usually devote more energy to offspring production and development.arrow_forwardBirds are more likely to form pair-bonds than mammals because … Group of answer choices: A. Bird reproductive physiology makes it easier to judge paternity certainty B. Flight makes it easier to find mates C. Bird species are unable to defend critical resources the way mammals can D. Male mammals have higher levels of testosterone making them more likely to fight E. Either bird parent can sit on the nest or feed chicks while the chicks are too young to flyarrow_forwardMake guarding is a reproductive tactic that functions to directly:  A. Increase the number of males to which a male has access. B. Reduce the males paternity uncertainty. C. Increase male reproductive output. D. Reduce the females fitness.  arrow_forward
- #4: In clown fish (chose one answer) A. Individuals are protandrous.B. It is better to be male when you are small and a female when you are big.C. Everyone begins life as a male.D. All of the abovearrow_forwardMale honey bees (Apis mellifera) die when they mate for the first and only time, achieving suicidal monogamy when their genitalia are donated to the female. Try to explain the male’s suicidal mating behavior in light of the alternative hypotheses for male monogamy. What predictions follow from these different explanations? What data are required to resolve the issue?arrow_forward#1: Elephant Seals have a polygynous mating system, in which a few males mate with many females while other males do not mate at all. Nearly all females produce one offspring per year. Assuming a 50:50 sex ratio, we would expect the average reproductive rate to be (chose one answer) a. higher in females b. the same in males and females c. higher in males d. random e. none of the abovearrow_forward
- Assume you are studying a lizard that is involved in males displaying to females and females choosing males to mate with. The females will raise the offspring by themselves. Which of the following benefits might females be receiving in this system? a. Direct benefits b. Indirect benefits c. Both a. and b. d. Neither a. nor b.arrow_forwardFecundity is defined as the number of offspring produced pera. mating.b. brood.c. year.d. individual.arrow_forwardAmong the Great Apes, yet unlike our chimpanzee and bonobo 'cousins', as humans we combine a unique evolutionary blend of different physical and behavioral traits commonly identified with either 'pair-bonding' or 'tournament' species. Which of the following options below inaccurately matches our shared characteristics with each type? Select one: a. moderate to high degree of sexual dimorphisms - tournament b. moderate to highly monogamy in coupled relationships - tournament c. male mate pickiness - pair bonding d. high parental investment - pair bonding e. females selecting mates for parenting skill - pair bonding f. moderate to high variability in male reproductive success & aggression - tournamentarrow_forward
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