Cheatography
https://cheatography.com
evolutionary explanations for partner preferences
This is a draft cheat sheet. It is a work in progress and is not finished yet.
natural selection vs sexual selection
natural selection |
sexual selection |
natural selection is a theory presented by Darwin and is often referred to as survival of the fittest - it is the idea that those organisms with the most adaptive characteristics are able to survive different selection pressures to then reproduce and have offspring. this will pass on the genes for the adaptive characteristics to their offspring which will occur for many generations and will increase the frequency of the adaptive allele in the gene pool |
whereas sexual selection is a seperate theory also presented by Darwin suggesting that those with the prefferred characteristics are more likely to be selected fo mating so that their genes are passsed on to future generations. |
what makes natural selection and sexual selection different? |
sexual selection is different to natural selection as the mating partners are selected by organisms rather than nature. the characteristics selected by the mating partener also may also not be the most adaptive to survive selection pressures |
|
what is anisogamy?
anisogamy - |
the differenece in male and female gametes (sperm and eggs) |
females |
males |
females have a limited supply of eggs and can be sure that the child is theirs as they physically give birth - females invest more into their child |
males produce millions of sperm but cannot be certain that the child is theirs - they invest less into their child |
anisogamny gives rise to two different mating strategies |
|
|
intrasexual and intersexual selection
intrasexual selection |
- competition within one sex (usually males) to outcompete each other. this increases their chance of selection by females so that they can pass on their genes to future generations |
some examples of areas in which organisms have to compete for female selection may include
- strength
- hight
- intelligence |
intersexual selection |
- when one sex (usually females) develops preferences for desirable qualities for potential mates (usually males) - this leads to the preference of the sex determining the areas in which the other sex must outcompete |
for example if females seek resources males must work on this to outcompete others also seeking a partner |
Buss - sex differences in human mate preferences
aim |
to investigate whether there are diffeerneces between females and females and how they choose their mates - also to investigate whether these differences are universal and yhe |
|
|
|
