<unk>  is an interdisciplinary subfield of behaviour genetics that studies the role of genetic and environmental influences on<unk>  behaviour. Classically,<unk>  behavioural geneticists have studied the inheritance of behavioural traits. The field was originally focused on determining the importance of genetic influences on<unk>  behaviour (for e.g., do genes regulate<unk>  behavioural attributes). It has evolved to address more complex questions such as: how important are genetic and/or environmental influences on various<unk>  behavioural traits; to what extent do the same genetic and/or environmental influences impact the overlap between<unk>  behavioural traits; how do genetic and/or environmental influences on behaviour change across development; and what environmental factors moderate the importance of genetic effects on<unk>  behaviour (gene-environment interaction). The field is interdisciplinary, and draws from genetics, psychology, and statistics. Most recently, the field has moved into the area of statistical genetics, with many behavioural geneticists also involved in efforts to identify the specific genes involved in<unk>  behaviour, and to understand how the effects associated with these genes changes across time, and in conjunction with the environment. Traditionally, the<unk>  behavioural genetics were a psychology and phenotype based studies including intelligence, personality and grasping ability. During the years, the study developed beyond the classical traits of<unk>  behaviour and included more genetically associated traits like genetic disorders (such as fragile X syndrome, Alzheimer's disease and obesity). The traditional methods of behavioural-genetic analysis provide a quantitative evaluation of genetic and non-genetic influences on<unk>  behaviour. The family, twin and adoption studies marks the huge contribution for laying down the foundation for current molecular genetic studies to study<unk>  behaviour. Francis Galton
Human behaviour genetics
Human genetics
Public health genomics
Behavioural genetics
Genetics
Nutritional science
Behavioral epigenetics
Cancer epigenetics