Final answer:
In cases of strong sexual selection, one sex is typically competitive, displaying traits to attract or fend off competitors, while the other sex is choosy, selecting mates based on desirable characteristics.
Step-by-step explanation:
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 competitive, and members of the sex subject to weak sexual selection will be choosy. This is to say that the sex experiencing intense competition for mates will generally evolve traits that are useful in that competition, such as aggressiveness, displays of physical prowess, or ornamentation. These are often seen in males of many species. On the other hand, the sex that is less subject to competition, and instead does the choosing, typically becomes more selective about potential partners, evaluating mates based on various characteristics that may signify good genes or high fitness, such as physical features or behaviors.