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Genes, Evolution and Behavior

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study of the relative power and limits of genetic and ... 3)Bitter-Bitter 4) Tasteless-salty * Like spinach, turnips, sauerkraut.... Behavior Genetics ... – PowerPoint PPT presentation

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Title: Genes, Evolution and Behavior


1
Genes, Evolution and Behavior
  • How does genetic predisposition influence
    behavior?

2
Behavior Genetics
  • Behavior Genetics
  • study of the relative power and limits of genetic
    and environmental influences on behavior

3
Genes Their Location and Composition
4
Genes Our Biological Blueprint
  • Chromosomes
  • threadlike structures made of DNA that contain
    the genes
  • DNA (deoxyribonucleic acid)
  • complex molecule containing the genetic
    information that makes up the chromosomes
  • has two strands-forming a double helix- held
    together by bonds between pairs of nucleotides

5
Genes Our Biological Blueprint
  • Genes
  • biochemical units of heredity that make up the
    chromosomes
  • a segment of DNA capable of synthesizing a protein

6
Dominant and Recessive Genes
Mo T Her S Genes
Fathers two Genes
M O T H E R G E N e
F1
F2
M1
M2
7
Finger length etc
  • Ring finger vs. Forefinger
  • -Draw a line
  • Results
  • Short forefinger is recessive in females
  • More males have short forefingers
  • Thumb bend?
  • prayer hands

8
Taste Sensitivity- PTC Sodium Benzoate
  • Results
  • If you have the recessive gene-no taste
  • Approx- 70 taste
  • -30 No Taste
  • (must be own saliva)
  • SB- 1) Bitter-salty 2) Bitter-sweet
  • 3)Bitter-Bitter 4) Tasteless-salty
  • Like spinach, turnips, sauerkraut.

9
Behavior Genetics
  • Identical Twins
  • develop from a single fertilized egg that splits
    in two, creating two genetically identical
    organisms
  • Fraternal Twins
  • develop from separate eggs
  • genetically no closer than brothers and sisters,
    but they share the fetal environment

10
Behavior Genetics
  • Temperament
  • a persons characteristic emotional reactivity
    and intensity
  • Interaction
  • the effect of one factor (such as the
    environment) depends on another factor (such as
    heredity)

11
Minnesota Twins Study
  • Striking Similarities
  • Body Double Film

12
Evolutionary Psychology
  • Natural Selection
  • the principle that, among the range of inherited
    trait variations, those that lead to increase
    reproduction and survival will most likely be
    passed on to succeeding generations
  • Mutation
  • a random error in gene replication that leads to
    genetic damage

13
Are our preferences inherited?
  • Survey 1
  • Results ( board)
  • Survey 2
  • Results ( board)
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