ALH1PAL Lecture Notes - Lecture 7: Twin
Document Summary
The coding of genes in each cell determines certain traits that we have, specifically the physical attributes like eye colour, hair colour, ear size, height, and other traits. However, it is unknown as to whether more abstract attributes like personality, intelligence, sexual orientation, likes and dislikes are gene-coded in our dna, too. One highly debated topic is whether or not sexual preference is determined by genetics. Another is whether the tendancy to commit criminal acts, divorce and engage in abusive behaviour can be justified by the "behavioural genes". The behavioural genes are somewhat proven to exist in studies on fraternal twins. When fraternal twins are reared apart, they show the same similarities in behaviour and response as if they have been reared together. The nurture theory suggests that genetic influence over abstract traits may exist; however, the environmental factors are the real origins of our behaviour.
