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Chapter 3: Genetics (Chapter 3 vocabulary (PET (use radioactive substance…

- - - - increase level of some trait (y-axis) associated with a more adverse environment (x-axis)
        
        as you increase GENETIC RISK, you only actually get the risk if you have ENVIRONMENT RISK too
    - - level of some trait (y-axis) varies for both better and worse for some genotypes
        
        some people do REALLY GOOD or REALLY BAD in drastic environments
- - - - family studies: examine blood relatives to see how much they resemble each other on a specific trait
      - twin studies: analysis of how traits differ in identical vs. fraternal twins
      - adoption studies: resemblance of adopted children and both their biological and adoptive parents
- - - - various environment exposures DO NOT alter DNA, but they DO alter DNA EXPRESSION
      - methylation: add a methyl group to a DNA molecule to REPRESS gene activity