Biological

• Monozygotic Twins


  identical twins formed when one zygote splits into two separate masses of cells, each of which develops into a separate embryo
• Dizygotic Twins


  twins who are produced when two separate eggs are fertilised by two separate sperm at roughly the same time
• Biological explanations:

  • Brain
  • Illness
  • Neurochemistry
  • Genetics
  • Other

  
• Biological approach evaluation

  + Highly scientific: high validity and reliability

  + Causal explanations: cause and effect can be established, higher validity

  + Can be used to treat people: used for medication to treat different disorders, allows them to live a normal life

  - Behaviour is not purely biological: no twin studies have a 100% concordance rate so environment has an effect that is ignored

  - Biological determinism: behaviour is due to physiological structure and cannot be changed, ignores free will

  - Biological reductionism: human behaviour is more complex than simply just biological factors

  = Impact on economy: if all behaviour is innate, justice system is ineffective