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Sexual Selec
Sophy Lane…read more

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Sexual Selection
0 The ability to reproduce is a key part of evolution ­
the name of the game is to pass on your genes to the
next generation. To help with this, males of a species
often have colourful and noticeable areas of their
body, for example the peacock has a bright tail to
attract females. Whilst this is maladaptive in the sense
that it makes them easier to find than more
camouflaged animals, it has evolved because the more
magnificent the tail, the more likely the male is to be
selected for breeding by a female.…read more

Slide 3

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Inter and Intra Sexual
0 Intrasexual Selection ­ Mate competition
Where members of one sex ­ usually males ­ compete with the other members
for access to a females genes. Victory means the ability to pass on genes, and so
the strongest animals will pass on the best genes
0 Intersexual Selection ­ Mate choice
The preferences of the of one sex for traits in the opposite sex obviously play a
key part in the areas of competition. For example if women preferred tall men,
then this would be the area that they compete against each other in. These
preferences can be anything from plumage (for peacocks) to economic standing
(for humans). These desirable traits are passed onto the next generation, as well
as the ability to support the children and give them protection. Humans are
perpetually pre-programmed to attend these displays of indicators, which in turn
increases their willingness to mate with the winners ­ if they aren't there then
they cannot see them!…read more

Slide 4

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Short Term Mating
0 According to the parental investment theory, males have developed a
greater desire for short term relationships than women, and would
ideally seek sex earlier in a relationship than the female. However
females would not be subjected to the same evolutionary pressures.
Over the course of a year, a male who has engaged in coitus with a
large number of women and impregnate them has passed on a large
number of his genes than a less successful male. However, women
who had engaged in coitus with the same amount of men would only
have been able to produce the one child. The more time a man waits
before impregnating women, the larger amount of chances he has
missed to spread his genes ­ Buss 2007.
0 Buss and Schmit, 1993, found that men have substantially lower
standards when it comes to short term mating than women, and that
they tend to experience a decrease in attraction after sex. This is an
evolutionary adaptation which makes them scarper onto the next
woman.…read more

Slide 5

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Short Term Mating
0 Clarke and Hatfield, 1989 sent out male and female researchers to approach total
strangers on a college campus, they said `Hi, I've been noticing you around campus and
I find you very attractive' they then asked them three questions:
- Would you go on a date with me?
- Would you go back to my apartment with me?
- Would you have sex with me?
0 Of the females approached 50% agreed to a date, 6% agreed to going back to the
apartment and 0% agreed to sex, of the males approached 50% agreed to a date, 69%
agreed to going back to the apartment and 75% agreed to sex! These results, which
have been replicated in subsequent studies, provide evidence that men have evolved
psychological mechanisms to ensure success in short term mating such as the desire
for sexual diversity, the tendency to have sex as often as possible, and consenting to
sex with strangers.
0 However, this can lack mundane realism, as the situation is not exactly life like, it may
be that the participants were psychology students, and so cottoned on to the
experiment, and skewed the results, or that they have encountered a separate
experimenter somewhere else around the campus.…read more

Slide 6

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Long Term Mating
0 In long term mating, the difference between investment time from
both genders is minimal, they both invest long term in the child. As a
consequence, both sexes should be choosier about their mate. If they
choose wrong, they are stuck with a long term consequence of wasted
resources and opportunities. Women are predicted to be more
choosier than men, as they have a biological commitment to the
offspring, and invest the most. She has four main areas:
- have resources to invest in her and the children
- are able to protect her and the children
-show promise as a good parent
- are compatible enough to cause little cost to her and the kids.
Males on the other hand, are attracted to females who display
signals of fertility. Buss found universal trends in males and females
preferences when choosing a mate.…read more

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