Answers
- aggression
- schizophrenia
- popularity
- fraternal
- identical
- environments
- 40 years
- evidence
- controversial
- stumbling block
- important tool
- molecular research methods
- relies on
- same family
- identical twins
- Genes
- fraternal twins
- researcher
- sets of identical twins
- particular trait
- likeness
- variations
- heritability
- quantify
- unique environment
- partners
- similar
- mates
- more than 50 percent
- genetically influenced traits
- mothers and fathers
- same homes
- peers
- interactions
- Separately / inclination for violence
- maltreated
- this type of complication
- genetic mechanisms
- recessive
- brown eyes