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Assortative Mating

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chela limbrunner

on 8 December 2010

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Transcript of Assortative Mating

Assortative mating in genetics refers to the degree of phenotypic randomness in human mating. More specificly the term refers to selection of a mate based on phenotype.
Example
marrying within ones religous group
marrying within ones race
marrying according to educational level
marrying according to height/weight
marrying according to S.E.S.
Differential Parental Investment:
Eveloutionary beginnings:
Sexual strategies:
Mate Selection:
Attracting and keeping a mate:
Replacing a mate:
Robert Trivers' theory of parental investment predicts that the sex making the largest investment in lactation, nurturing and protecting offspring will be more discriminating in mating and that the sex that invests less in offspring will compete for access to the higher investing sex .

Reproduction is costly. Individuals are limited in the degree to which they can devote time and resources to producing and raising their young, and such expenses may also be detrimental to their future mating and survival
Sexual strategies are adaptive solutions to mating problems. Our ancestors competed successfully for and retained mates who were reproductively valuable.
mate preference
desire for sex
jealousy
feelings of love
awareness of infidelity
do not require conscious awareness
woemens greater investment begins with the large and finite egg (400) compared to the mans tiny sperm which are replenished at the rate of twelve million per hour.
ASSORTATIVE MATING
WHY IS IT THAT A PEACOCK HAS SUCH ELABORATE PLUMES?
THIS TRAIT EVOLVED BECAUSE FEMALES PREFER TO MATE WITH COLORFUL MALES.
REPRODUCTIVE BENEFITS RATHER THAN SURVIVAL BENEFITS=SEXUAL SELECTION
ONE FORM ALLOWS THE ANIMAL WITH GREATER STRNEGTH AND INTELLIGENCE GREATER ACESS TO FEMALES
ANOTHER FORM MEMBERS OF ONE SEX CHOOSE MEMBERS OF THE OPPOSITE SEX BECAUSE OF A DESIRED TRAIT.
ANIMALS LACKING THE TRAIT ARE EXCLUDED FROM MATING AND THIER GENES PERISH.
MATES MAY BE LOST TO RIVALS, OR LEAVE TO PERSUE YOUNGER MORE COMPELLING MATES.
WOMEN HAVE AN INATE INSTINCT TO FIND A MAN WITH RESOURCES AS THIS WILL SECURE GREATER CHANCES OF SURVIVAL. WHEN FACED WITH A CHOICE OF TWO MATES IT MAKES SENSE TO CHOOSE THE ONE WHO IS SUCESFULL AT HUNTING, SKILLFUL AT MAKING FIRES, PROTECTIVE, NURTURING AND COMMITTED. AS A RESULT OF ANCESTORS WHO CHOSE A MATE WISELEY, CLEAR DESIRES IN TRAITS FOR A MATE EVOLVED.
Models: The poverty model states that the highest quality mates will pair off with eachother, leaving the rest of the population to make do with what they can secure.
The wedding ring model states that as people desire to find a mate because of social pressure, they will relax thier standards and settle for what they can get.
take the next best: individuals remember the highest quality mate they have had and use this as an aspiration model.
David M. Buss

An important factoristhe ratio of the sexes,or the number of available men related to women.
When there is a surplus of women men will be hesitant to commit. Men will prefer to persue many casual relationships with various women.
Not all mates are worth keeping!
It isimportan toknowwhen tocut ones losses in a bad relationship,otherwisethe sucess of our genes may suffer.
Intelligance
good predictor of future econimic resources.
betterschools
more education
higher paying jobs

In conclusion: once we are aware of these interesting innate instincts and the tendancy towards assortative mating in the human population we can better understand why we are home on Friday night reading our genetics book......we are choosy, selective and saving our time and resources for a WORTHY mate. Good luck to all in your search for a suitable partner! Thank you for your attention to my presentation.
Male mate preferences:
Men look for youth and beauaty as these are traits which indicate fertility and good genes. Clear eyes, good skin, wist to hip ratio.
Outline:
Davis Buss and his GREAT contribution
Differential Parental investment
Sexual strategies
Male mate preferences
Evoloutionary beginnings
Attracting and keeping a mate
Mate selection
Models Intelligence
Video
Full transcript