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Relationships, Sexual selection & human reproductive behaviours -…
Relationships
Sexual selection & human reproductive behaviours
Intrasexual selection
About QUANTITY
Males:
Individuals of
same
sex must
outcompete
other members
Allows them to gain
access
to the opposite sex
Successful individuals are able to
mate
and
pass on genes
Losers do
NOT
pass on their genes
Link to human reproductive behaviour
QUANTITY over quality
Characteristics
that lead to
success
during the contests become more
widespread
in the
gene pool
e.g: strength
--> Winners get
reproductive advantage
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IntrAsexual:
'A'
for
alpha
Key word:
Compete
Intersexual selection
About QUALITY
Females:
Individuals of the
same
sex
evolve
preferences
for
desirable qualities
in
potential mates
Members of the
opposite
sex who
possess
these
characteristics
with gain a
mating advantage
over those who don't
e.g: attractiveness/status
Preferences of one sex determine the area which the other sex must compete in
Link to human reproductive behaviour
QUALITY over quantity
Huge
biological demands
placed on females
(pregnancy)
--> requires great
investment
&
energy
Support needed
before, during & after
offspring are born
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