Chapter 3 Genes, Evolution and the Environment

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Chapter 3Genes, Evolution and the Environment
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Basic Genetics

• Inherit 46 chromosomes
• 23 from mom
• 23 from dad
• DNA
• Genes
• Building blocks of individual life

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Natural Selection

• Charles Darwin
• Natural Selection
• Some genes in a population spread more than
  others
• 4 core principles of natural selection
• Some individuals are better suited than others to
  the demands of their environment
• Those that are better suited are more likely to
  survive and leave more offspring
• Because of genetics, offspring inherit the traits
  of their parents
• Reproduction perpetuates the genes of better
  suited organism

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Natural Selection at Work
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Research

• Twin Studies
• Adoption Studies
• The Jim twins!!!!

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Jim Twins

• Both named Jim
• Both married to women named Linda
• Both divorced from women named Betty
• Jim S. named son James Allan
• Jim L. named son James Alan
• Both Liked math, but hated spelling
• Both were sheriffs deputies
• Both drank Miller Lite, chain smoked Salem
  cigarettes
• Both chewed finger nails
• Both built the same bench in their back yard

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How much of a role does genetics play in who we
are?
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Environmental Factors

• Differences between siblings

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Environmental Factors

• Peer Influences

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Environmental Factors

• Gender

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• Sexual Orientation