Final answer:
Males have certain traits in mating due to sexual selection, where females choose mates based on specific traits. This leads to males developing elaborate ornaments or displays to attract females.
Step-by-step explanation:
Males have certain traits when females have choice in mating because of sexual selection. Sexual selection is the process by which males and females of a species have different selective pressures in obtaining mates. In many cases, females are more selective and choose mates based on specific traits, such as elaborate ornaments or displays. This results in males developing these traits to attract females and increase their chances of mating.