Evolutionary psychology

Natural Selection

Those members of a species who have

characteristics which are better suited to the

environment will be more likely to breed, and thus

to pass on these traits.

Sexual Selection

A facet of natural selection, sexual selection is how

the "best mate" is chosen to produce and protect

healthy offspring.

Intrasexual Selection

Competition between one sex (usually males) and

for access to mates. Usually the "strongest" ends up

being able to pass on his (or her) genes.

Intersexual Selection

Intersexual Selection

Members of one sex (usually females) choose

members of another sex based on a specific

characteristic - e.g. a dance, great feathers or an

amazing jawline.

Parental Investment theory

According to this theory the sex that is physiologically required to invest more in offspring evolves to be more choosy regarding mates, because mating with a low quality or non investing partner is more costly than sex