What two factors form someone’s phenotype?

What are non-identical twins also known as?

Name a type of study used to test for a genetic basis to behaviour.

Explain natural selection.

What does this approach state must be looked at to understand behaviour?

The rate of probability that two people with shared genes will develop the same organic disease is known as what?

What type of determinism does this approach argue?

Give a real life application example for the biological approach.