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BEHAVIORAL GENETICS
AND EVOLUTIONARY
PSYCHOLOGY
Genetics
   We have 23 pairs of
    chromosomes

   Half from genetic
    mother, half from
    genetic father

   What do genes do?
Function of genes
                  Chromosome is made
                   of genes

                  Each gene codes for
                   a protein

                  Genes can be turned
                   “on” or “off”
How similar are we?
   Humans are 99.9%
    similar

   Humans and Chimps
    are 96% similar

   Humans and
    bananas are 50%
    similar!
Twin Studies
   Twin studies examine
    similarities and
    differences between
    identical and fraternal
    twins

   Identical twins are far
    more similar than
    fraternal
Separated at Birth?
                  Famous example:
                   The Jim Twins

                  Same name, same
                   wives, same pets,
                   same hobbies, same
                   habits

                  Could this just be
                   coincidence?
Adoption Studies
   Another fantastic way
    to examine the
    impact of genes and
    environment.

   Personalities- largely
    genetic

   Then why are
    siblings so different?
Temperament
             Difficult
               10%

             Easy
               40%

             Slow to warm up
               15%



             Identical twins have more
              similar temperaments
Gene Environment Interactions

   Environment triggers gene activity

   Gene activity influences the environment

   Temperament as an example?

   Choosing environments
Evolutionary Psychology
   What makes us similar?

   What is natural selection?

   Not just “survival of the fittest”

   Grandpa Simpson: I used to be with it, but then
    they changed what it was. Now what I'm with isn't
    it, and what's it seems weird and scary to me. It'll
    happen to you...
Selection
   Environmental
    Pressures

   Sexual Pressures

   Domestication and
    Breeding
Why has evolution made us fat?
Gender Differences
   It’s all about the sex!

   Men are more likely
    to be sexually liberal

   Women are more
    likely to be sexually
    conservative

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4 behavioral genetics and evolutionary psychology

  • 2. Genetics  We have 23 pairs of chromosomes  Half from genetic mother, half from genetic father  What do genes do?
  • 3. Function of genes  Chromosome is made of genes  Each gene codes for a protein  Genes can be turned “on” or “off”
  • 4. How similar are we?  Humans are 99.9% similar  Humans and Chimps are 96% similar  Humans and bananas are 50% similar!
  • 5. Twin Studies  Twin studies examine similarities and differences between identical and fraternal twins  Identical twins are far more similar than fraternal
  • 6. Separated at Birth?  Famous example: The Jim Twins  Same name, same wives, same pets, same hobbies, same habits  Could this just be coincidence?
  • 7. Adoption Studies  Another fantastic way to examine the impact of genes and environment.  Personalities- largely genetic  Then why are siblings so different?
  • 8. Temperament  Difficult  10%  Easy  40%  Slow to warm up  15%  Identical twins have more similar temperaments
  • 9. Gene Environment Interactions  Environment triggers gene activity  Gene activity influences the environment  Temperament as an example?  Choosing environments
  • 10. Evolutionary Psychology  What makes us similar?  What is natural selection?  Not just “survival of the fittest”  Grandpa Simpson: I used to be with it, but then they changed what it was. Now what I'm with isn't it, and what's it seems weird and scary to me. It'll happen to you...
  • 11. Selection  Environmental Pressures  Sexual Pressures  Domestication and Breeding
  • 12. Why has evolution made us fat?
  • 13. Gender Differences  It’s all about the sex!  Men are more likely to be sexually liberal  Women are more likely to be sexually conservative