Chapter 7

Question 1

sexual selection

Answer 1

A form of natural selection that involves a struggle between the individuals of one sex, generally the males, for the possession of the other sex

Question 2

instrasexual selection

Answer 2

a form of sexual selection whereby members of one sex compete with each other for access to the other sex

Question 3

intersexual selection

Answer 3

a form of sexual selection in which individuals of one sex choose which individuals of the other sex to take as mates

Question 4

Bateman’s principle

Answer 4

the idea that, since eggs require greater energy to produce than sperm, females should be the choosier sex and this should result in greater variance in the reproductive success of males

Question 5

nuptial gift

Answer 5

prey presented by members of one sex to members of the other sex during courtship

Question 6

good genes model

Answer 6

a model of sexual selection in which females choose to mate with males that possess traits that are indicators of good health and vigor. females that choose the males with such genes receive indirect benefits, in that their offspring receive some of the good genes that led their mother to choose a male as their mate in the first place.

Question 7

honest indicators

Answer 7

the idea that traits that are costly to produce are more difficult to fake and hence truly indicate the genetic quality of an individual

Question 8

sensory bias

Answer 8

a theory of sexual selection that hypothesizes that females may initially prefer male traits that elicit the greatest amount of stimulation from their sensory systems. Also known as sensory exploitation, sensory drive, or preexisting bias.