Mate Choice

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Published on 6 Jul 2012
School
Department
Course
Professor
Finish from Last Week - Infanticide
Highest risk for young
children two years or
less
Higher rates of child murder
by step-parents than genetic
parents
Children are abused more
often by step-parents than if
they live with both genetic
parents
Male sexually selected infanticide
in humans?
-
Decreased
number of
sexual partners
High investment
in female and
offspring to
increased
survival of
infants
Higher paternity
certainty
Commitment to a
single female
Long-term strategy
Little to no
investment in
any particular
female
Risky strategy;
potential for
decreased infant
survival
Potential for
very high RS if
successful at
using strategy
but if
unsuccessful
may have had a
higher RS if he
had stayed with
one woman
Multiple female sexual
partners
Short-term strategy
Human male mating strategies
-
Infant care
Resources (ie. Food)
Protection of self and infant
Direct benefits
Genetic benefits
Superior genes for offspring
(based on body
morphology, physical
ability)
Complementary genes (not
closely related to you,
increased genetic
variability)
Indirect benefits
What do females select for
Receive services from the
male like grooming
Care for offspring and
protection from infanticidal
males
Male gets mate,
female gets meat,
protein, and other
food
Correlation between
meat sharing in
chimpanzees and
consequential
copulations with that
female
"Sex for food" hypothesis
Choosing male 'friends' and mates
Selecting for Direct benefits
Focus on parental care as
attractive in males
Preference for high-status males
because of an increased
availability to resources
Men with many resources can
then potentially attract many
mates
Female mate choice in humans
Dominance thought to
indicate genetic quality
Often females will select for
dominant males as mates
Selecting for Indirect Benefits
Dom = prominent chin,
heavy brow ridges,
muscular face
Low Dom = 'weak' chin,
slight brow ridges, fleshy
face
Judge based on facial features
Females selecting for high-status men
Potentially problematic with shifting
social positioning of female status
Genes that control immunological
activity; what 'matches' when
doing transplants
Where your body senses self and
non-self
Protecting against disease
Parasite resistance
Involves in
MHC molecules found in
body secretions (urine,
perspiration, etc.)
Useful in mate choice that
favours non-related partners
MHC - Major histocompatibility
complex: cluster of highly variable
genes that code for cell-surface
molecules that control immunological
activity [HLA - human leukocyte
antigen - in humans]
Rate scent of men having
dissimilar MHC-types as
more attractive
Women on Contraceptive
pull show opposite trend;
not in a position where
they're hormonally
available to mate, want to
be around familiar males
for protective purposes
T-Shirt studies
Tests from MHC
Female mate choice in humans (indirect)
Male Mate Choice
Male baboons and chimps will turn down
opportunities to copulate with very young
females (not attractive to males)
-
Most female primates will peak in middle-
age range
Old and young infants have poor RS;
reproductive senescence in old age
Age of females and reproduction
-
RTL: prime-aged females (4-9 years);
highest RS and infant survival
Chimp: Older females (up to 50 years); may
have better maternal skills (longer time to
learn), may have better genetic quality
indicated by ability to live that long
Most preferred females depends on species
-
Human Male Mate Choice
Health and youth as focus of mate selection; high
reproductive potential
-
Waist to hip ratio (WHR)
Hip fat, which is determined by hormones,
which indicate fertility
Both sexes have the same WHR until
puberty (0.9)
Increase of fat makes the ratio smaller (0.7
most often viewed as attractive across
boundaries of body weights and cultures)
Post-menopausal women tend to have a
WHR close to 0.9
Ratio linked to ovarian function
Low WHR with increase of estrogen,
good indicator of fecundity (capacity
to produce offspring)
WHR can indicate life stage as related to
reproduction, especially because it's
related to the ratio of estrogen:androgen
Cues of female age
-
Announcement: Midterm next week. Questions from reading and lecture. Know terms and definitions
given in text reading and in the lecture slides.
Mate Choice
May-29-12
1:00 PM
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Document Summary

Know terms and definitions given in text reading and in the lecture slides. Higher rates of child murder by step-parents than genetic parents. Highest risk for young children two years or less. Children are abused more often by step-parents than if they live with both genetic parents. Superior genes for offspring (based on body morphology, physical ability) Complementary genes (not closely related to you, increased genetic variability) High investment in female and offspring to increased survival of infants. Little to no investment in any particular female. Potential for very high rs if successful at using strategy but if unsuccessful may have had a higher rs if he had stayed with one woman. Care for offspring and protection from infanticidal males. Male gets mate, female gets meat, protein, and other food. Correlation between meat sharing in chimpanzees and consequential copulations with that female. Focus on parental care as attractive in males.

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