<span>Research in behavioural genetics has shown that identical twins reared apart often have similar personality traits. This result suggests that both genetic inheritance and environmental factors contribute to personality. </span>
<span>Personality traits are under a significant degree of genetic influence, usually influenced by a very large number of genes but environmental influences also play a strong role. The environmental factors tend to make family members more different from one another, not more similar.</span>
Though most of these are correct, I personally think that 'g' is the best answer.
<span>Cell culture can be used to produce complex proteins.</span>
