The genetic makeup of an individual, the particular set of genes the individual possesses
Phenotype
The observable characteristics shown by an individual that are a result of both genes and the environment
Concordance rate
The extent to which twins share the same characteristics
Evolution
Fitness is all about how well an organism is adapted to its environment, a gene that Is adapted at one time may become maladaptive if the environment changes
Neurochemical basis of behaviour
much of our thought and behaviour relies on chemical transmission in our brain by using neurotransmitters, an imbalance of neurochemicals can cause mental disorders
