Question 1

When male and female hangflies mate,the number of sperm transferred to the female increases linearly with an increased time of mating.What determines the length of time that male and female hangflies mate?

Accepted Answer

The size of the prey...

Question 2

Describe the experiments that Adam Jones and colleagues (2002)used with rough-skinned newts to demonstrate the differential relative strength of sexual selection among between males and females.What is the significance that all females tend to mate with at least one male,and often with several males,whereas many of the males failed to mate and many mated only once or twice? Discuss whether sexual selection is a more potent force in the evolution of males or females,and why.

Accepted Answer

Adam Jones and colleagues (2002) conduct...

Question 3

In studies on the pipefish Nerophis ophidion,females are larger than males and appear to be under greater sexual selection pressure than males.The females have two traits that male pipefish of the species lack.What are these two traits?

Accepted Answer

A)   dark blue stripes and lateral spines
B)   bright orange stripes and skin folds on their bellies
C)   dark blue stripes and skin folds on their bellies
D)   lateral spines and skin folds on their belliesE) B) and C)
F) A) and C)

Question 4

Maureen Stanton and colleagues (1986) ,experimenting with wild radishes (Raphanus raphanistrum) ,demonstrated that sexual selection on male flowers has led to ________.

Accepted Answer

A)   many small flowers that attract male pollinators
B)   showy flowers that attract male pollinators
C)   flowers with large nectar-producing glands to attract male pollinators
D)   flowers where male and female flowers appear on the same plantE) None of the above
F) B) and C)

Question 5

Which of the following has NOT been observed as a trait of sperm competition?

Accepted Answer

A)   applying pheromones that reduce the female's attractiveness
B)   the production of large ejaculates containing many sperm
C)   depositing a copulatory plug
D)   prolonged copulation during mating
E)   All of the above have been observed as traits of sperm competition.F) A) and E)
G) All of the above

Question 6

In his study of the Mediterranean fruit flies (Ceratitis capitata) ,Matthew Gage (1991) found that ________.

Accepted Answer

A)   males allowed to mate alone produced 2 1/2 times more sperm than those mating in the presence of other males
B)   males allowed to mate alone produced 2 1/2 times less sperm than those mating in the presence of other males
C)   males produced the same amount of sperm when they were allowed to mate alone or when they mated in the presence of other males
D)   males engaged in aggressive behavior when mating in the presence of other malesE) A) and D)
F) All of the above

Question 7

The differences between males and females of a species are called ________.

Accepted Answer

A)   sexual morphism
B)   male/female dimorphism
C)   sexual differentiation
D)   sexual dimorphismE) A) and B)
F) A) and C)

Question 8

In general,when sexual selection is strong for one sex and weak for the other,we can predict that members of the sex subject to strong sexual selection will be ________,and members of the sex subject to weak sexual selection will be ________.

Accepted Answer

A)   choosy; competitive
B)   aggressive; passive
C)   competitive; showy
D)   competitive; choosyE) A) and D)
F) All of the above

Question 9

Describe the unusual pollination system used by orchids of the genus Catasetum,which are pollinated by male euglossine bees.

Accepted Answer

The male flower attracts the bee by using a chemical similar to that used by bees to attract mates,and then shoots a pollinarium that adheres to the back of the bee.This pollinarium is then carried to the female flower,where it lodges onto the stigmatic cleft.

Question 10

John Hoogland (1998) studied Gunnison's prairie dogs (Cynomys gunnisoni) and observed that an increase in litter size was observed when females ________.

Accepted Answer

A)   chose males that were the largest in the colony
B)   mated with more than one male
C)   extended the time of copulation with individual males
D)   established a large territory for matingE) None of the above
F) B) and D)

Question 11

Explain why male lions,after they have entered a new pride of female lions,will often engage in the practice of infanticide.

Accepted Answer

Male lions often kill offspring that have not yet been weaned from their mothers so that the females will physiologically be receptive to mating,thus improving the entering male's reproductive success.

Question 12

In male-male combat observed in marine iguanas,why do males tend to grow to sizes that exceed the optimal size for survival?

Accepted Answer

Male iguanas become larger tha...

Question 13

Natural selection would appear to act against long tails in male red-collared widowbirds,given that longer tails reduce body condition over the mating season.Based on the experiments of Pryke and Andersson (2005),why do long tails appear to be favored despite their obvious disadvantage?

Accepted Answer

Long tails are favored in male red-collared widowbirds because females of the species are choosy,and they select mates based on longer tail length.

Question 14

Darwin called differential reproductive success due to variation among individuals in success at getting mates ________.

Accepted Answer

A)   sexual success ratio
B)   sexual selection
C)   reproductive selection
D)   dimorphic selectionE) B) and C)
F) A) and D)

Question 15

Pawlowski and colleagues (2000) gathered data from over 3,000 Polish men,and investigated the hypothesis that sexual dimorphism in humans is the result of female choice.They found that there was a slight but significant level of sexual selection on ________.

Accepted Answer

A)   the body mass index (BMI)  of men in their twenties, thirties, and forties for both marriage and producing offspring
B)   the weight of men in their twenties, thirties, and forties for both marriage and producing offspring
C)   the height of men in their twenties, thirties, and forties for both marriage and producing offspring
D)   the intelligence quotient (IQ)  of men in their twenties, thirties, and forties for both marriage and producing offspringE) None of the above
F) All of the above

Question 16

According to the experiments of Delph and colleagues (1996),is sexual selection often stronger for male or female flowers,and what tends to drive this selection?

Accepted Answer

Sexual selection is ...

Question 17

Adam Jones and colleagues (2000) studied the mating behaviors of broad-nosed pipefish (Syngnathus typhle) in a laboratory situation.For which sex is sexual selection a more potent evolutionary force?

Accepted Answer

A)   females
B)   males
C)   Both sexes are under equal sexual selection pressure.
D)   Neither sex is under sexual selection pressure.E) A) and C)
F) A) and B)

Question 18

A key event that determines reproductive success involves members of one sex choosing their mates from among the opposite sex,and is termed ________.[two words]

Accepted Answer

intersexua...

Question 19

In general,mothers typically make a larger parental investment in each offspring than males do.What is meant by the term parental investment?

Accepted Answer

Parental investment is the ene...

Question 20

To study sexual dimorphism in humans,Napoleon Chagnon (1988)studied the Yąnomamö,a premodern tribe that live in the Amazon rain forest in Venezuela and Brazil.What specific trait of the Yąnomamö correlated with an increased number of wives a corresponding increased number of children?

Accepted Answer

Men who have participated in a...

Exam 11: Sexual Selection

When male and female hangflies mate,the number of sperm transferred to the female increases linearly with an increased time of mating.What determines the length of time that male and female hangflies mate?

Correct Answer
verified
The size of the prey...
View Answer

Correct Answer
Answered by ExamLex AI
Adam Jones and colleagues (2002) conduct...
View Answer

In studies on the pipefish Nerophis ophidion,females are larger than males and appear to be under greater sexual selection pressure than males.The females have two traits that male pipefish of the species lack.What are these two traits?

Correct Answer
verified

Maureen Stanton and colleagues (1986) ,experimenting with wild radishes (Raphanus raphanistrum) ,demonstrated that sexual selection on male flowers has led to ________.

Correct Answer
verified

Which of the following has NOT been observed as a trait of sperm competition?

Correct Answer
verified

In his study of the Mediterranean fruit flies (Ceratitis capitata) ,Matthew Gage (1991) found that ________.

Correct Answer
verified

The differences between males and females of a species are called ________.

Correct Answer
verified

In general,when sexual selection is strong for one sex and weak for the other,we can predict that members of the sex subject to strong sexual selection will be ,and members of the sex subject to weak sexual selection will be .

Correct Answer
verified

Describe the unusual pollination system used by orchids of the genus Catasetum,which are pollinated by male euglossine bees.

Correct Answer
verified
The male flower attracts the bee by using a chemical similar to that used by bees to attract mates,and then shoots a pollinarium that adheres to the back of the bee.This pollinarium is then carried to the female flower,where it lodges onto the stigmatic cleft.

John Hoogland (1998) studied Gunnison's prairie dogs (Cynomys gunnisoni) and observed that an increase in litter size was observed when females ________.

Correct Answer
verified

Explain why male lions,after they have entered a new pride of female lions,will often engage in the practice of infanticide.

Correct Answer
verified
Male lions often kill offspring that have not yet been weaned from their mothers so that the females will physiologically be receptive to mating,thus improving the entering male's reproductive success.

In male-male combat observed in marine iguanas,why do males tend to grow to sizes that exceed the optimal size for survival?

Correct Answer
verified
Male iguanas become larger tha...
View Answer

Natural selection would appear to act against long tails in male red-collared widowbirds,given that longer tails reduce body condition over the mating season.Based on the experiments of Pryke and Andersson (2005),why do long tails appear to be favored despite their obvious disadvantage?

Correct Answer
verified
Long tails are favored in male red-collared widowbirds because females of the species are choosy,and they select mates based on longer tail length.

Darwin called differential reproductive success due to variation among individuals in success at getting mates ________.

Correct Answer
verified

Pawlowski and colleagues (2000) gathered data from over 3,000 Polish men,and investigated the hypothesis that sexual dimorphism in humans is the result of female choice.They found that there was a slight but significant level of sexual selection on ________.

Correct Answer
verified

According to the experiments of Delph and colleagues (1996),is sexual selection often stronger for male or female flowers,and what tends to drive this selection?

Correct Answer
verified
Sexual selection is ...
View Answer

Adam Jones and colleagues (2000) studied the mating behaviors of broad-nosed pipefish (Syngnathus typhle) in a laboratory situation.For which sex is sexual selection a more potent evolutionary force?

Correct Answer
verified

A key event that determines reproductive success involves members of one sex choosing their mates from among the opposite sex,and is termed ________.[two words]

Correct Answer
verified
intersexua...
View Answer

In general,mothers typically make a larger parental investment in each offspring than males do.What is meant by the term parental investment?

Correct Answer
verified
Parental investment is the ene...
View Answer

To study sexual dimorphism in humans,Napoleon Chagnon (1988)studied the Yąnomamö,a premodern tribe that live in the Amazon rain forest in Venezuela and Brazil.What specific trait of the Yąnomamö correlated with an increased number of wives a corresponding increased number of children?

Correct Answer
verified
Men who have participated in a...
View Answer

Exam 11: Sexual Selection

When male and female hangflies mate,the number of sperm transferred to the female increases linearly with an increased time of mating.What determines the length of time that male and female hangflies mate?

Correct AnswerverifiedThe size of the prey...View AnswerShow Answer

Correct AnswerAnswered by ExamLex AIAdam Jones and colleagues (2002) conduct...View AnswerShow Answer

In studies on the pipefish Nerophis ophidion,females are larger than males and appear to be under greater sexual selection pressure than males.The females have two traits that male pipefish of the species lack.What are these two traits?

Correct AnswerverifiedShow Answer

Maureen Stanton and colleagues (1986) ,experimenting with wild radishes (Raphanus raphanistrum) ,demonstrated that sexual selection on male flowers has led to ________.

Correct AnswerverifiedShow Answer

Which of the following has NOT been observed as a trait of sperm competition?

Correct AnswerverifiedShow Answer

In his study of the Mediterranean fruit flies (Ceratitis capitata) ,Matthew Gage (1991) found that ________.

Correct AnswerverifiedShow Answer

The differences between males and females of a species are called ________.

Correct AnswerverifiedShow Answer

In general,when sexual selection is strong for one sex and weak for the other,we can predict that members of the sex subject to strong sexual selection will be ________,and members of the sex subject to weak sexual selection will be ________.

Correct AnswerverifiedShow Answer

Describe the unusual pollination system used by orchids of the genus Catasetum,which are pollinated by male euglossine bees.

Correct AnswerverifiedThe male flower attracts the bee by using a chemical similar to that used by bees to attract mates,and then shoots a pollinarium that adheres to the back of the bee.This pollinarium is then carried to the female flower,where it lodges onto the stigmatic cleft.

John Hoogland (1998) studied Gunnison's prairie dogs (Cynomys gunnisoni) and observed that an increase in litter size was observed when females ________.

Correct AnswerverifiedShow Answer

Explain why male lions,after they have entered a new pride of female lions,will often engage in the practice of infanticide.

Correct AnswerverifiedMale lions often kill offspring that have not yet been weaned from their mothers so that the females will physiologically be receptive to mating,thus improving the entering male's reproductive success.

In male-male combat observed in marine iguanas,why do males tend to grow to sizes that exceed the optimal size for survival?

Correct AnswerverifiedMale iguanas become larger tha...View AnswerShow Answer

Natural selection would appear to act against long tails in male red-collared widowbirds,given that longer tails reduce body condition over the mating season.Based on the experiments of Pryke and Andersson (2005),why do long tails appear to be favored despite their obvious disadvantage?

Correct AnswerverifiedLong tails are favored in male red-collared widowbirds because females of the species are choosy,and they select mates based on longer tail length.

Darwin called differential reproductive success due to variation among individuals in success at getting mates ________.

Correct AnswerverifiedShow Answer

Pawlowski and colleagues (2000) gathered data from over 3,000 Polish men,and investigated the hypothesis that sexual dimorphism in humans is the result of female choice.They found that there was a slight but significant level of sexual selection on ________.

Correct AnswerverifiedShow Answer

According to the experiments of Delph and colleagues (1996),is sexual selection often stronger for male or female flowers,and what tends to drive this selection?

Correct AnswerverifiedSexual selection is ...View AnswerShow Answer

Adam Jones and colleagues (2000) studied the mating behaviors of broad-nosed pipefish (Syngnathus typhle) in a laboratory situation.For which sex is sexual selection a more potent evolutionary force?

Correct AnswerverifiedShow Answer

A key event that determines reproductive success involves members of one sex choosing their mates from among the opposite sex,and is termed ________.[two words]

Correct Answerverifiedintersexua...View AnswerShow Answer

In general,mothers typically make a larger parental investment in each offspring than males do.What is meant by the term parental investment?

Correct AnswerverifiedParental investment is the ene...View AnswerShow Answer

To study sexual dimorphism in humans,Napoleon Chagnon (1988)studied the Yąnomamö,a premodern tribe that live in the Amazon rain forest in Venezuela and Brazil.What specific trait of the Yąnomamö correlated with an increased number of wives a corresponding increased number of children?

Correct AnswerverifiedMen who have participated in a...View AnswerShow Answer

Correct Answer
verified
The size of the prey...
View Answer

Correct Answer
Answered by ExamLex AI
Adam Jones and colleagues (2002) conduct...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

In general,when sexual selection is strong for one sex and weak for the other,we can predict that members of the sex subject to strong sexual selection will be ,and members of the sex subject to weak sexual selection will be .

Correct Answer
verified

Correct Answer
verified
The male flower attracts the bee by using a chemical similar to that used by bees to attract mates,and then shoots a pollinarium that adheres to the back of the bee.This pollinarium is then carried to the female flower,where it lodges onto the stigmatic cleft.

Correct Answer
verified

Correct Answer
verified
Male lions often kill offspring that have not yet been weaned from their mothers so that the females will physiologically be receptive to mating,thus improving the entering male's reproductive success.

Correct Answer
verified
Male iguanas become larger tha...
View Answer

Correct Answer
verified
Long tails are favored in male red-collared widowbirds because females of the species are choosy,and they select mates based on longer tail length.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Sexual selection is ...
View Answer

Correct Answer
verified

Correct Answer
verified
intersexua...
View Answer

Correct Answer
verified
Parental investment is the ene...
View Answer

Correct Answer
verified
Men who have participated in a...
View Answer