Final answer:
Intersexual selection occurs when individuals of one sex choose mates of the other sex, often based on visually attractive traits. This type of selection can lead to traits that do not enhance survival but are preferred by the opposite sex.
Step-by-step explanation:
Intersexual selection occurs when individuals of one sex choose mates of the other sex. This type of selection is often complex and can be based on visual, aural, tactile, and chemical cues. An example of intersexual selection is when female peacocks choose to mate with males with the brightest plumage. In this case, the selection leads to traits in the chosen sex that do not enhance survival but are most attractive to the opposite sex.