Natural selection is the process by which individuals with traits that are better suited to their environment are more likely to survive and reproduce, passing those traits on to their offspring.

The good genes hypothesis proposes that individuals select mates who possess traits that indicate good genes, such as physical attractiveness, symmetry, and health, as these traits are likely to be passed on to their offspring.

Assortative mating refers to the tendency for individuals to select mates who are similar to themselves in terms of various traits, such as physical appearance, intelligence, and social status.

Disassortative mating refers to the tendency for individuals to select mates who are different from themselves in terms of various traits, such as physical appearance, intelligence, and social status.

Sexual selection is the process by which individuals with traits that are attractive to the opposite sex are more likely to mate and produce offspring, passing those traits on to their offspring.

Parental investment theory proposes that individuals select mates who possess traits that indicate their ability to provide resources and protection for their offspring, such as financial stability, social status, and parenting skills.

Mate choice copying refers to the tendency for individuals to select mates who possess traits that are similar to those of their parents, as these traits are likely to be familiar and desirable.

The Zahavi handicap principle proposes that individuals select mates who possess traits that indicate their ability to resist parasites and diseases, as these traits are likely to be beneficial to their offspring.

Fisherian runaway selection proposes that individuals select mates who possess traits that are exaggerated and costly to produce, as these traits are likely to indicate good genes and genetic fitness.

Random mating refers to the tendency for individuals to select mates without regard to their traits, resulting in a random distribution of traits in the population.

Negative frequency-dependent selection proposes that individuals select mates who possess traits that are rare in their population, as these traits are likely to be more beneficial and less likely to be shared by competitors.

Positive frequency-dependent selection proposes that individuals select mates who possess traits that are common in their population, as these traits are likely to be more beneficial and more likely to be shared by competitors.

Altruistic mate choice proposes that individuals select mates who possess traits that are beneficial to their offspring, even if those traits are costly to the individual, as this behavior increases the survival and reproductive success of the offspring.

Selfish mate choice proposes that individuals select mates who possess traits that are beneficial to themselves, even if those traits are costly to their offspring, as this behavior increases the survival and reproductive success of the individual.

Strategic mate choice proposes that individuals select mates who possess traits that are beneficial to both themselves and their offspring, as this behavior increases the survival and reproductive success of both the individual and their offspring.